1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
frutty [35]
3 years ago
8

During a marathon, runners draw heavily on their internal reserves of glycogen (carbohydrate) and triglycerides (fat) to fuel mu

scle contraction. Initially, energy is derived mostly from carbohydrates, with increasing amounts of fat being used as the race progresses. If runners use up their muscle glycogen reserves before they finish the race, they hit what is known as "the wall.," a point of diminished performance that arises because fatty acids from triglyceride breakdown cannot be delivered to the muscles quickly enough to sustain maximum effort. One trick that marathon runners use to avoid the wall is to drink a cup of strong black coffee an hour or so before the race begins. Coffee contains caffeine, which is an inhibitor of cyclic AMP phosphodiesterase. How do you suppose inhibition of this enzyme helps them avoid the wall
Biology
1 answer:
g100num [7]3 years ago
7 0

Answer:

The activity of cyclic AMP phosphodiesterase is prevented by caffeine. The caffeine prevents further dissociation of cAMP, which eventually increases the response within the body. The activity of neurotransmitters, that is, of noradrenaline or epinephrine, gets increased due to enhancement in response.  

This further enhances the activity of the heart, the rate of muscle contractions, blood pressure that further helps in delivering more oxygen to the brain, and other parts of the body. Thus, the inhibition of the enzyme cyclic AMP phosphodiesterase helps the athletes to prevent the wall.  

You might be interested in
How are different forms of a gene distributed to offspring
Kamila [148]
The genes are from the nuclei of the egg (from the female) and the sperm (from the male) the different traits are joined to create the particular genes.

(I might be right.)
6 0
3 years ago
What is the name of the hormone that brings about the breakdown of juvenile features in insects​
MrRa [10]
Throughout the young larval stages a small gland behind the brain, called the corpus allatum, secretes juvenile hormone (also known as neotenin).
3 0
3 years ago
N the early 1900's a scientist hypothesized a link between DNA and the production of proteins in the cytoplasm. However, the fac
Dovator [93]

The plasma membrane or the cell membrane is the one that protects the cytoplasm of a cell. It is mostly composed of lipids and proteins. It has a phospholipid bilayer that controls the entering and exiting of molecules in the cell and at the same time, provides protection for the cell or plasma membrane. It has polar head and a nonpolar tail. Proteins embedded within the phospholipid bilayer have the same function of the plasma membrane that includes selective transport. The phospholipid bilayer consists mainly of the lipid molecules.

7 0
3 years ago
How can scientists use vertebrate embryo development to build evidence for the claim that vertebrates are somewhat closely relat
Yuri [45]

Answer:

All early vertebrate embryos develop tails and gill slits, and therefore this type of anatomical evidence supports common ancestry  

Explanation:

Embryology is a discipline that studies the structural/anatomical features and development of embryos. Embryos are a fundamental piece of evidence to support common ancestry among vertebrates because there are homologous structural features that can only be observed during the first stages of vertebrate development. For example, all vertebrate embryos (e.g., fish, chicken and human embryos), develop tails and gill slits during their first stages of embryo development. In consequence, embryology provides evidence for evolution of vertebrates.

3 0
3 years ago
Why do your fingers look like prunes after swimming for a long time?
Alina [70]

Answer:

pruney fingers are caused by shrinking blood vessels. When you soak in water, your nervous system sends a message to your blood vessels to shrink. Your body responds by sending blood away from the area, and the loss of blood volume makes your vessels thinner.

7 0
2 years ago
Read 2 more answers
Other questions:
  • When the sense of smell is blocked, as when we have a cold, foods do not taste the?
    14·1 answer
  • O help maintain homeostasis the respiratory system depends on the nervous system for signals to
    13·1 answer
  • What is the smallest number of nucleotides that must be added or subtracted to change the triplet grouping of the genetic messag
    13·1 answer
  • The electromagnetic spectrum is made up of A:sound waves and light waves B:only light waves that you can see C:light waves you c
    5·2 answers
  • An rna molecule is looking for a job in a protein synthesis factory. it asks you to write its resume. this rna molecule is not y
    9·1 answer
  • The best term to describe the general process by which microorganisms cause diseases is known as the best term to describe the g
    13·1 answer
  • The SRY gene:________.
    7·2 answers
  • A nurse is caring for a client who underwent cardiac catheterization. the client's skin was found to be blanched, and there was
    13·2 answers
  • For which method of determining population size is the population not aware of the sampler’s presence?
    14·2 answers
  • PLEASE ANSWER
    15·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!