Question
Asked Nov 11, 2019
1 views

Describe the anatomy of movement of the wave of cell depolarization throughout the heart during the cardiac cycle. 
 

check_circle

Expert Answer

Step 1

The cardiac cycle:

It is comprised of a whole relaxation and contraction of both the atrium and ventricles. It lasts for about 0.8 seconds. It starts with the diastolic phases of all the heart chambers and the blood flows passively into the atria from the veins and it passes the atrioventricular valves and comes into the ventricles.

Step 2

The depolarization phase:

A rapid and a positive modification in the voltage through the cell membrane that is known as depolarization. It lasts for less than 2 ms in the ventricular cells and 10/20ms in sinoatrial node (SAN) cells. It takes place due to the net flow of positive charge into the cell. When it occurs, the voltage inside the cell rises slightly.

Step 3

The depolarization wave:

It starts in the right atrium. Then the impulse spans through the superior parts of both the atria and then down across the contractile cells.

The cont...

Want to see the full answer?

See Solution

Check out a sample Q&A here.

Want to see this answer and more?

Solutions are written by subject experts who are available 24/7. Questions are typically answered within 1 hour.*

See Solution
*Response times may vary by subject and question.
Tagged in

Science

Biology

Other

Related Biology Q&A

Find answers to questions asked by student like you
Show more Q&A
add
question_answer

Q: A particular gene in dogs contributes to coat color. The two alleles exhibit incomplete dominance.  ...

A: According to Mendelian inheritance, every trait is influenced by a pair of alleles and these alleles...

question_answer

Q: microbology question- How do we group bacteria based on where they get their energy?

A: Bacteria are unicellular organisms that are present in diverse environment. Some bacteria are helpfu...

question_answer

Q: 8-9. White eyes (w) is sex-linked and recessive in Drosophila. Cruved wings(cu) and black body (b) a...

A: Inheritance is the process of transmitting the traits from parent to offspring. Traits of an organis...

question_answer

Q: 16. Why is re-circularized insert generally not a problem in cloning procedures, while re- circulari...

A: Cloning or DNA cloning is the process of making multiple identical copies of the gene of interest by...

question_answer

Q: How do hypertonic, hypotonic and isotonic solution affect animal cells?

A: Hypertonic solutions have higher concentrations of dissolved molecules outside the cell, hypotonic s...

question_answer

Q: Which of the following could result in theDens fracturing and/or stabbing into the medullar oblongat...

A: The odontoid process is also known as the dens, which is a protuberance of the axis. Hanging is the ...

question_answer

Q: How is glucose actively transported from gut lumen to gut epithelium even when the concentration of ...

A: The mechanism of glucose uptake differs throughout tissues depending upon the metabolic needs of the...

question_answer

Q: Which of the following skeletal muscle fiber types would have the fastest contractions and the great...

A: Muscles are composed of a group of muscle fibers. Fibers of skeletal muscles are classified into thr...

question_answer

Q: In terms of neurotransmitters and receptors, explain how the two divisions of the ANS can have contr...

A:  ANS (autonomic nervous system) has two divisions namely, parasympathetic and sympathetic. Parasympa...