Cardiac Muscle

Question 1

aka for cardiac muscle

Answer 1

• Involuntary striated muscle

Question 2

o Cardiac muscle cells are much ________ than skeletal muscle cells and have only _______ nucleus per cell

Answer 2

smaller
one

Question 3

Cardiac muscle cells are _______ that they are wide and often have ______________.

Answer 3

longer
multiple branches

Question 4

 Securely fasten the cells together
 Transmit impulses from cell to cell to allow large groups of cardiac muscles cells to contract in a coordinated manner
 Networks of cardiac muscle cells around the cardiac chambers function as if they were each a large, single unit

Answer 4

o Intercalated discs

Question 5

In cardiac muscles, _______ cell contracts.

Answer 5

each

Question 6

Some cardiac cells contract more rapidly than other and if ______ cells touch, the _______ contracting cell adopts the faster cells rate

Answer 6

two
slower

Question 7

 “Pacemaker” generates the impulse that begins each heartbeat
 Impulse follows a carefully controlled path through the conduction system of the heart

Answer 7

SA node

Question 8

The SA node is located in the wall of the ______ atrium.

Answer 8

right

Question 9

Nerve supply to the heart can ______ the hearts activity but is not needed to ________ contractions of the heart.

Answer 9

modify
initiate

Question 10

Which nervous system does this for the cardiac muscle?
 Stimulate the heart to beat harder and faster as part of the fight-or-flight response that kicks in when an animal feels threatened

Answer 10

o Sympathetic nervous system

Question 11

Which nervous system does this for the cardiac muscle?
 Inhibit cardiac function, causing the heart to beat more slowly and with less force when the body is relaxed and resting

Answer 11

o Parasympathetic nervous system