Varicose veins are a form of chronic venous insufficiency, or a defect in the veins that prevents them from pumping blood properly.
What are venous valves?These consist of two elastic flaps of tissue that alternately open and close allowing blood to flow through the valve to another vein.
These work in conjunction with the musculoskeletal system, the muscles are constantly tensing and releasing, a pattern that causes the valves to open and close as needed.
Many veins are found, especially in the lower extremities, because they have valves that act in only one direction, a tightening of the muscles results in an opening of the valves, while a relaxation of the muscles results in the closing of the valves.
Therefore, we can conclude that one of the main functions of the venous valves is to guarantee the adequate return of blood to the heart, if a return flow occurs, the blood can begin to accumulate in the veins, potentially damaging them.
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What is the order of the digestive phases?
Answer:
cephalic phase, the gastric phase, and the intestinal phase.
Explanation:
bes/tie next time goog/le it
If scientists wanted to learn more about evolution by studying
biochemistry, they would study all but one of these molecules. Which
molecule would NOT offer much information about the history of life?
Answer:
Evolution isn't real
Explanation:
If God made humans in his own image, then why do people say that we evolved from animals. Read Genesis 1
why is it important to understand
(&) study the way bacteria growth (&) spread ?
Answer:
can you help me
please then i will helpnyou
please help me due today
when people who are allergic to pollen come in contact with pollen their eyes begin to water an inch due to the release of
Answer:
I believe the word you are looking for is "Histamine"
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Question 4 (1 point)
Proteins can be enzymes.
True
False
Answer:
True
Proteins are basically enzymes or at the very least most of them
can someone calculate the genotypes and phenotypes of this pls
Say this was about breeds of chicken nuggets, some with and some without these features, then we can say that the genotypes of this nugget must be just that, mostly nugget, but due to certain influences, there will be some part that is not just nugget, so:
More than 80% nugget
Less than 20% non-nugget genotype.
This means that the phenotype, that shows up, is something similar to this: a mostly nugget being.
The type of molecule represented below is found in organisms.
Which statement correctly describes the sequence of bases found in this type of molecule?
A) It changes every time it replicates
B) It determines the characteristics that will be inherited
C) It is exactly the same in all organisms
D) It directly controls the synthesis of starch within a cell
Answer:
B) It determines the characteristics that will be inherited
Explanation:
The molecule is DNA (it has a double helix structure) which contains genetic information needed for every living organism.
Hope this helps!
Answer:
D
Explanation:
A and C are so incorrect. The reason why D is the correct answer is because DNA does not determine what gets inherited, just what gets added to the gene pool.
DNA does however control the synthesis of proteins by acting as instructions. Then these instructions are read and carried out by RNA to finally complete the process.
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Answer to question 1?
Answer:
does it have a cell wall
Explanation:
(D) if it has a cell wall it's animal
Describe what happens to organisms that live in an environment with limited resources
PLS ANSWER FAST
They face limiting factors so they will either have to begin evolving to compensate for the limited resources or they will die out.
Create 5 unsafe scenarios that could happen in the lab, school, or home and 5 solutions for those unsafe situations.
Example:
Unsafe:
Janice was working on a project and accidentally cut the cord to one of the glue guns. Afraid that she would get in toruble, she quietly placed the glue gun back in the bin. Another student used the glue gun and was injured.
Safe:
Janice was working on a project and accidentally cut the cord to one of the glue guns. Eventhough she was afraid, she let Ms. Smith know immediately. No one else was able to use the glue gun and no one was hurt.
Immature cells that have the potential to develop into many, but not all, classes of mature cells (e.g., blood, skin, hair, neurons) are called:
Answer:
Stem cells
Explanation:
Stem cells are the types of cells that are immature and have the potiental to develop into different kinds of mature cells.
1. Hypothesize An aquarium hobbyist wants to breed guppies with large, fan-shaped,
red tails. The hobbyist has a large number of guppies with assorted tail colors and
shapes in an aquarium. Write a hypothesis that explains how the hobbyist should
proceed to breed a population of guppies with the desired traits.
They should separate pure lines (red fan-shaped tails) to cross them with other phenotypes and then observe phenotypic proportion in the offspring. It is Mendelian genetics.
What is Mendelian genetics?Mendelian genetics refers to the process of observing the phenotypic proportions from a given genetic cross.
Mendelian genetics is always associated with a genetic process known as complete dominance.
Complete dominance occurs when the recessive allele is completely masked in heterozygous individuals.
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How is DDT spraying for malaria different from spraying for agriculture?
Evidence from countries that continued using DDT showed that correct and timely use of indoor spraying can reduce malaria transmission by up to 90%. In the past, India was able to use DDT effectively to substantially cut the number of malaria cases and deaths.
It also was effective for insect control in crop and livestock production, institutions, homes, and gardens. DDT's quick success as a pesticide and broad use in the United States and other countries led to the development of resistance by many insect pest species.
explain natural selection (simply)
Answer:
Natural selection can act on any heritable phenotypic trait, and selective pressure can be produced by any aspect of the environment, including mating selection and competition with members of the same or other species. However, this does not imply that natural selection is always directional and results in adaptive evolution...
Explanation:
Dose that help you???
A change in the order of DNA bases that code for a respiratory protein will most likely cause
A) The production of a starch that has a similar function
B) The digestion of the altar gene by enzymes
C) A change in the sequence of amino acids determined by the gene
D) The release of antibodies by certain cells to correct the error
Answer:
C) A change in the sequence of amino acids determined by the gene
Explanation:
A change in the order of DNA bases is also known as a gene mutation. This will lead to the production of undesired amino acids, and eventually undesired proteins.
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Who does Hà describe as "Our Cowboy" in the novel?
Answer: The american who sponsor her family
Explanation:
Ha and her family meet both prejudice and kindness in Alabama. A nice, subtle aspect of Inside Out & Back Again is Ha's own preconceptions about things: their sponsor wears a cowboy hat and cowboy boots, so Ha calls him “the cowboy”
Hormone X activates the cAMP second messenger system in its target cells. The greatest response by a cell would come from _____.
Base your answer on the structure and location of a cellular component represented in the diagram below .
What does this polymer in the diagram most likely contain ?
A) ATP
B) DNA
C) Enzymes
D) lipids
Answer:
B) DNA
Explanation:
It can't be ATP, enzymes, or lipids because none of those are found in the nucleus. This diagram depicts a 2-stranded double helix, also known as DNA.
Hope this helps!
EXPLAIN THIS POSTER BY DISCUSSING
ABOUT THE DISEASE, CAUSES, SIGNS AND SYMPTOMS, AND WHAT POSSIBLE MEANS TO AVOID SUCH A DESEASE.
Answer:
Explanation:
this person has a serious lack of vitamins to the point it is extremely life threatening. He needs to increase his vitamin levels as they are getting so low it is adapting his bone structure
True or false: The plasma membrane is a fluid structure in which phospholipids and proteins are able to move laterally within the membrane.
Answer:
below
Explanation:
True.
Membrane Fluidity: The plasma membrane is a fluid combination of phospholipids, cholesterol, and proteins. Carbohydrates attached to lipids (glycolipids) and to proteins (glycoproteins) extend from the outward-facing surface of the membrane.
In a comparison of birds and mammals, the condition of having four limbs is.
Answer:
In a comparison of birds and mammals, the condition of having four limbs is a shared ancestral character
Why is a series circuit not a good way to wire a house? Question 5 options: Any break in a series circuit, such as a burned-out light bulb, will turn it into a parallel circuit. Any break in a series circuit, such as a burned-out light bulb, will result in overloading all the other light bulbs. Any break in a series circuit, such as a burned-out light bulb, breaks the entire circuit. Any break in a series circuit will result in a fire.
The correct answer is option Any break in a series circuit, such as a burned-out light bulb, breaks the entire circuit as it explains the disadvantage.
A downside of collection circuits is if there may be a ruin or fault at any of the home equipment related to the circuit, the last home equipment could be reduced from the supply. Regarding parallel circuits, home equipment may be related and disconnected to the circuit without affecting different components of it.
What will happen if the bulb will burn out?if one bulb burns out in a sequence circuit, then this could ruin the circuit. This is due to the fact each tool in a sequence circuit needs to paintings well for the circuit to be complete. Unlike in a parallel circuit - in which every mild has its personal circuit - so despite the fact that one bulb burns out, the last bulbs will nevertheless function.
Hence concluded that Any break in a series circuit, such as a burned-out light bulb, breaks the entire circuit can cause severe damage.
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How does pH affect osmosis rates?
Answer:
increase in pH increases the osmotic pressure and vice versa
The enzyme that reads the template strand and makes a complementary strand of dna is:.
Answer: DNA polymerase
Studying lunar rocks, asteroids, and meteorites can provide information about Earth's early history.
True
False
Answer:
True because rocks in space collided with earth in the early days
A type of genetic inheritance in which two phenotypes are seen together on the offspring is known as:.
Answer:
Codominance
Reason:
A codominance connection exists between two copies of a gene. Individuals inherit one copy of a gene, known as alleles, of each parent. If they are different , the allele that is dominant will typically be displayed, while the influence of the other allele, the recessive, will be concealed.
Answer:
Codominance
A codominance connection exists between two copies of a gene. Individuals inherit one copy of a gene, known as alleles, of each parent. If they are different , the allele that is dominant will typically be displayed, while the influence of the other allele, the recessive, will be concealed.
Explanation:
A codominance relationship exists between two gene copies. Individuals may develop one copy of both parent's genes., known as alleles. If they vary, the dominant allele will usually be visible, while the effect of the recessive allele will be hidden.
An animal can wound a tree by scratching away the bark.. The tree can respond to the wounded many ways. Usually sapped quickly covers the wound, and then the tree covers the wound with new growth.
The diagram below shows a cross-section of the tree with a healed wound. What process works most directly with the transport system to heal the wound.
a. cellular reproduction
b. photosynthesis
c. water intake
d. carbohydrate system
Answer:
the answer is A, cellular reproduction.
Explanation:
because cellular reproduction is a process by which cells duplicate their contents and then divide to yield multiple cells with similar, if not duplicate, contents, basically reforming itself again.
Who is in the same trophic level as the frog? Select all that apply.
Snake
FOX
Hawk
Owl
Bird
Frog
Rabbit
Grasshopper
Answer:
Frog, grasshopper, and rabbit
Explanation:
depending by the region, these may vary, but these are at or near the same trophic level
Which of the following is NOT a mutagenic factor (causes mutations)?
O chemicals we smoke or eat
O drinking water
O X-rays
O tanning
A Non-mutagenic factor listed in the options is : ( B ) Drinking water
Mutagenic factorMutagenic factors are chemical elements or various forms of radiations such as X-rays, UV rays, Sun rays, which may cause a permanent and heritable changes ( mutations ) in the DNA, when exposed to these mutagenic factors.
Hence we can conclude that a Non-mutagenic factor is Drinking water
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