Heart muscle cells ______. A will not contract unless acetylcholine is released at a neuromuscular junction B use glucose as their primary energy source and are easily damaged by hypoglycemia C have gap junctions that allow action potentials to be transmitted from one cell to the next
Heart muscle cells ______. A will not contract unless acetylcholine is released at a neuromuscular junction B use glucose as their primary energy source and are easily damaged by hypoglycemia C have gap junctions that allow action potentials to be transmitted from one cell to the next
Biology: The Unity and Diversity of Life (MindTap Course List)
15th Edition
ISBN:9781337408332
Author:Cecie Starr, Ralph Taggart, Christine Evers, Lisa Starr
Publisher:Cecie Starr, Ralph Taggart, Christine Evers, Lisa Starr
Chapter31: Animal Tissues And Organ Systems
Section: Chapter Questions
Problem 8SQ: ______ muscle pulls on bones and _______ muscle regulates the diameter of blood vessels. a. Skeletal...
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Question
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Heart muscle cells ______.
| A |
will not contract unless acetylcholine is released at a neuromuscular junction
|
|
| B |
use glucose as their primary energy source and are easily damaged by hypoglycemia
|
|
| C |
have gap junctions that allow action potentials to be transmitted from one cell to the next
|
|
| D |
"are very long, with individual cells running the entire length of the heart"
|
Expert Solution
Step 1
Cardiac muscles are known as Myocardium.Cardiac muscles are different from skeletal muscle because they show rhythmic contraction and is not under voluntary control.Cardiac muscles are striated similarly as skeletal muscle cells.
Step 2
In heart,cardiac muscles are connected to each other through gap junctions.These junctions form low resistance pathways.
In heart ,cardiac muscles are connected through Intercalated disks.These disks are irregular transverse thickening of sarcolemma in which desmosomes are present.
Role of desmosome is to hold the cells together.
Gap junctions are present adjacent to the intercalated disks which helps in direct spread of action potentials from one myocyte to next.
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