1. The source of the electrical currents that you measured on the skin throughout a normal electrocardiogram is:   a. regional differences in depolarization state between parts of the myocardium       b. The SA node cells   c. the opening and closing of the tricuspid and bicuspid valves   d. depolarizations of the muscle and nerve cells close to the electrode site    e. The AV node cells

Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
icon
Related questions
icon
Concept explainers
Question

1. The source of the electrical currents that you measured on the skin throughout a normal electrocardiogram is:

 

a.

regional differences in depolarization state between parts of the myocardium 

  

 

b.

The SA node cells

 

c.

the opening and closing of the tricuspid and bicuspid valves

 

d.

depolarizations of the muscle and nerve cells close to the electrode site 

 

e.

The AV node cells 

2. Release or discharge from which of the following is likely to produce a slowing in the rate at which the AV node transmits a depolarization? 

 

a.

Your coffee cup (caffeine) 

 

b.

the posterior lobe of the pituitary gland (Oxytocin) 

 

 

c.

the sympathetic nervous system 

 

d.

the parasympathetic nervous system (vagus nerve) 

 

e.

the medulla of the adrenal gland (epinephrine) 

3.Which of the following is unlikely to affect the force of contraction of an individual ventricular myocyte (muscle cell)?

 

a.

the amount of intracellular calcium ion 

 

b.

the medulla of the adrenal gland (adrenaline)

 

c.

the parasympathetic nervous system (vagus nerve or acetylcholine)

 

d.

How much it is stretched

 

e.

the sympathetic nervous system (noradrenaline)

4.

In which of the following vertebrate groups did the spontaneous depolarization of cardiac muscle first evolve?

 

a.

Reptiles. The evolution of the cleiodotic egg required spontaneous myocyte depolarization

 

 

b.

Fish. The basal and most successful vertebrate group has spontaneous myocyte depolarization

 

c.

Amphibians. Breathing air required hearts with spontaneous myocyte depolarization

 

 

d.

Humans. We are the only ones to do this, just watch Indiana Jones and the Temple of Doom for proof

 

e.

Mammals & birds. The evolution of fur and feathers required spontaneous myocyte depolarization

Expert Solution
trending now

Trending now

This is a popular solution!

steps

Step by step

Solved in 2 steps

Blurred answer
Knowledge Booster
Sensory-motor mechanisms
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, biology and related others by exploring similar questions and additional content below.
Similar questions
  • SEE MORE QUESTIONS
Recommended textbooks for you
Human Anatomy & Physiology (11th Edition)
Human Anatomy & Physiology (11th Edition)
Biology
ISBN:
9780134580999
Author:
Elaine N. Marieb, Katja N. Hoehn
Publisher:
PEARSON
Biology 2e
Biology 2e
Biology
ISBN:
9781947172517
Author:
Matthew Douglas, Jung Choi, Mary Ann Clark
Publisher:
OpenStax
Anatomy & Physiology
Anatomy & Physiology
Biology
ISBN:
9781259398629
Author:
McKinley, Michael P., O'loughlin, Valerie Dean, Bidle, Theresa Stouter
Publisher:
Mcgraw Hill Education,
Molecular Biology of the Cell (Sixth Edition)
Molecular Biology of the Cell (Sixth Edition)
Biology
ISBN:
9780815344322
Author:
Bruce Alberts, Alexander D. Johnson, Julian Lewis, David Morgan, Martin Raff, Keith Roberts, Peter Walter
Publisher:
W. W. Norton & Company
Laboratory Manual For Human Anatomy & Physiology
Laboratory Manual For Human Anatomy & Physiology
Biology
ISBN:
9781260159363
Author:
Martin, Terry R., Prentice-craver, Cynthia
Publisher:
McGraw-Hill Publishing Co.
Inquiry Into Life (16th Edition)
Inquiry Into Life (16th Edition)
Biology
ISBN:
9781260231700
Author:
Sylvia S. Mader, Michael Windelspecht
Publisher:
McGraw Hill Education