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
kvasek [131]
3 years ago
15

What is the basis for the delay between the atrial and ventricular contractions in a normal heart?

Biology
1 answer:
earnstyle [38]3 years ago
5 0

The main responsible for the delay among the atrial and ventricular contractions is the action potential conduction velocity of the AV node cells. If the atria and ventricles contract simultaneously, atria cannot give any help in filling the ventricles, which is needed, especially in those with stiff ventricles as in the elderly. Hence atria have to contract first and then the ventricles.

You might be interested in
Cell drinking; cell eating. Both are modeled here and are examples of A) osmosis. B) diffusion. C) endocytosis. Eliminate D) fac
N76 [4]

Answer;

-Endocytosis

Explanation;

-Endocytosis includes; phagocytosis, pinocytosis, and receptor mediated: Endocytosis brings substances into the cell, plasma membrane surrounds the substances to be taken in, encloses them in a membrane-bound sac (vesicle) and brings them into the cell

-Phagocytosis: endocytosis of large solid particles (“cell eating”)

-Pinocytosis: endocytosis of extracellular fluid that contains dissolved solutes (“cell drinking”)

-Receptor-mediated: highly selective, ligands bind to specific receptor proteins on the plasma membrane and are then taken into the cell

-Exocytosis: the reverse of endocytosis: substances are removed from the cell; vesicles fuse with plasma membrane and release their contents into the extracellular fluid; important in nerve cells to release neurotransmitter and secretory cells to release cell products (ex. digestive enzymes, protein hormones).

5 0
3 years ago
Why do we want to turn genes off or on?
Dmitrij [34]

The process of turning off and on of genes is known as gene regulation.

Explanation:

When the gene is turned on, it instructs the cells to construct a particular protein. The proteins are the molecules that build your body with collagen, tendons, and bones or keratin in your hair.

The gene regulatory proteins allow the individual genes of an organism to be turned on or off . in different cell types there are different selections of gene regulatory proteins. The patterns of the gene expression gives each cell its unique characteristics.

Each cell produces or turns on only a fraction of its genes. the remaining genes are repressed or turned off. this process is known as gene regulation. The signals from the environment or from other cells activate proteins called transcription factors.

3 0
3 years ago
Liquid water is heated until it boils and becomes water gas. Which statement is true about the water?
Svetach [21]
That then right after heat it evaporates and then the water that is still in the bowl lowers because of the heat that sends out water molecules that just disappear. :)
8 0
3 years ago
Nurse is caring for a client with cirrhosis. the nurse assesses the client at noon and discovers that the client is difficult to
polet [3.4K]
Ask how often the patient drinks alcohol.
5 0
3 years ago
If an owl eats a mouse that eats grass, the owl is a
Nastasia [14]
B. Second level consumer because it is not a plant(producer). It is not a decomposed and it is eating the mouse , a first level consumer .
5 0
3 years ago
Other questions:
  • The shedding of the endometrium occurs during _____ resulting from a decrease in ___________.
    15·2 answers
  • Plant called Jimson weedunit 4 genetics alternative test
    6·1 answer
  • Based on the diagram below, which part of an atom has the greatest mass?
    8·2 answers
  • Why is a large heavy exoskeleton less limiting for arthropods that live in water?
    6·1 answer
  • Explain why some groups doubt the occurrence of global warming and global climate change.
    12·2 answers
  • Please help I will give brainliest if right
    10·2 answers
  • Which of the following statements is correct?
    9·1 answer
  • What does ATP do for cells?
    7·1 answer
  • Why is acid precipitation such a problem all around the world?
    10·2 answers
  • Which of the following is an example of an involuntary muscle? *
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!