Biology 2e
2nd Edition
ISBN: 9781947172517
Author: Matthew Douglas, Jung Choi, Mary Ann Clark
Publisher: OpenStax
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Textbook Question
Chapter 33, Problem 22RQ
Why are intercalated discs essential to the function of cardiac muscle?
- The discs maintain the barriers between the cells
- The discs pass nutrients between cells
- The discs ensure that all the cardiac muscle cells beat as a single unit
- The discs control the heart rate.
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9. Identify the following when given an image of cardiac muscle tissue such as the one below:
. intercalated discs
● branching cells
●
nucleus
. cardiac muscle fibers
. striations
BEDDED
Which statement about activation of heart muscle cells is TRUE?
A
when a person is resting only a few small motor units in each ventricle are activated in each heartbeat
B
all of the muscle cells in the ventricles depolarize and contract together because they are connected by gap junctions
C
motor neurons must synapse with all of the muscle cells in the ventricles at the same time or fibrillation will occur
D
all of the heart muscle cells have unstable resting membrane potenitals and slowly depolarize to threshold at the same rate
do you think cardiac muscle tissue functions the same as skeletal muscle tissue?
Chapter 33 Solutions
Biology 2e
Ch. 33 - Figure 33.11 Which of the following statements...Ch. 33 - Figure 33.21 State whether each of the following...Ch. 33 - Figure 33.23 When bacteria are destroyed by...Ch. 33 - Which type of animal maintains a constant internal...Ch. 33 - The symmetry found in animals that move swiftly is...Ch. 33 - What term describes the condition of a desert...Ch. 33 - A plane that divides an animal into equal right...Ch. 33 - A plane that divides an animal into dorsal and...Ch. 33 - The pleural cavity is a part of which cavity?...Ch. 33 - How could the increasing global temperature...
Ch. 33 - Although most animals are bilaterally symmetrical,...Ch. 33 - Which type of epithelial cell is best adapted to...Ch. 33 - Which type of epithelial cell is found in glands?...Ch. 33 - Which type of epithelial cell is found in the...Ch. 33 - Which type of connective tissue has the most...Ch. 33 - Which type of connective tissue has a mineralized...Ch. 33 - The cell found in bone that breaks it down is...Ch. 33 - The cell found in bone that makes the bone is...Ch. 33 - Plasma is the. fibers in blood matrix of blood...Ch. 33 - The type of muscle cell under voluntary control is...Ch. 33 - The part of a neuron that contains the nucleus is...Ch. 33 - Why are intercalated discs essential to the...Ch. 33 - When faced with a sudden drop in environmental...Ch. 33 - Which is an example of negative feedback? lowering...Ch. 33 - Which method of heat exchange occurs during direct...Ch. 33 - The body’s thermostat is located in the...Ch. 33 - Which of the following is not true about...Ch. 33 - Which of the following is not a way that...Ch. 33 - How does diffusion limit the size of an organism?...Ch. 33 - What is the relationship between BMR and body...Ch. 33 - Explain how using an open circulatory system...Ch. 33 - Describe one key environmental constraint for...Ch. 33 - How can squamous epithelia both facilitate...Ch. 33 - What are the similarities between cartilage and...Ch. 33 - Multiple sclerosis is a debilitating autoimmune...Ch. 33 - When a person leads a sedentary life his skeletal...Ch. 33 - Why are negative feedback loops used to control...Ch. 33 - Why is a fever a “good thing” during a bacterial...Ch. 33 - How is a condition such as diabetes a good example...Ch. 33 - On a molecular level, how can endotherms produce...
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