Cardiac Muscle and Electrical Activity

Cardiac Muscle and Electrical Activity

12th Grade

18 Qs

quiz-placeholder

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Cardiac Muscle and Electrical Activity

Cardiac Muscle and Electrical Activity

Assessment

Quiz

Science

12th Grade

Practice Problem

Medium

Created by

ZACHARY CIHAL

Used 25+ times

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18 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the unique property of cardiac muscle that allows it to initiate an electrical potential at a fixed rate?

Autorhythmicity

Contractility

Excitability

Elasticity

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which type of cardiac muscle cells conduct impulses and are responsible for contractions that pump blood through the body?

Sinoatrial (SA) node

Myocardial contractile cells

Myocardial conducting cells

Purkinje cells

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the function of myocardial conducting cells in the heart?

Provide energy for contractions

Bind cardiac muscle cells together

Store calcium ions for contraction

Initiate and propagate the action potential

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the structure that allows the electrical impulse to reach the interior of cardiac muscle cells?

T tubules

Sarcoplasmic reticulum

Intercalated discs

Myofibrils

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the purpose of intercalated discs in cardiac muscle cells?

Store lipids and glycogen

Provide energy for contractions

Allow the passage of ions between cells

Support synchronized contraction of the muscle

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

True or false: Following a heart attack, damaged cardiac muscle cells are easily repaired or replaced.

true

false

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which clump of myocardial conducting cells is known as the pacemaker of the heart?

Atrioventricular (AV) node

Sinoatrial (SA) node

Purkinje fibers

Atrioventricular bundle

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