Heart muscle cells ______. Awill not contract unless acetylcholine is released at a neuromuscular junction Buse glucose as their primary energy source and are easily damaged by hypoglycemia Chave 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"

Answered: Heart muscle cells ______. A will…

Biology: The Unity and Diversity of Life (MindTap Course List)

14th Edition

ISBN:9781305073951

Author:Cecie Starr, Ralph Taggart, Christine Evers, Lisa Starr

Publisher:Cecie Starr, Ralph Taggart, Christine Evers, Lisa Starr

Chapter35: Structural Support And Movement

Section: Chapter Questions

Problem 2CT: After death, calcium pumps no longer function and the calcium ion concentration of muscle fiber...

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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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