Module 10 HW Questions

Question 1

What cardiac muscle structure is responsible for the striations?

Answer 1

sarcomere

Question 2

What type of junction prevents cardiac myocytes from separating during a contraction?

Answer 2

desmosomes

Question 3

What type of channel protein allows ions to pass from one cardiac myocyte to another?

Answer 3

gap junctions

Question 4

Which organelle makes up 25-35% of a cardiac muscle cell mass?

Answer 4

mitochondria

Question 5

The sarcoplasmic reticulum can supply _____________ of the calcium required to facilitate a cardiac muscle cell contraction

Answer 5

80-90%

Question 6

Cardiac muscle is dependent on ______________ calcium to facilitate a contraction

Answer 6

ECF

Question 7

What is the contractile unit in a cardiac muscle cell?

Answer 7

sarcomere

Question 8

What are the 3 types of cardiac muscle?

Answer 8

1) atrial
2) ventricular
3) excitatory-conductive

Question 9

What are the 2 functional syncytia in the heart?

Answer 9

atrial and ventricular

Question 10

The division of the heart’s 2 syncytia allows the atria to contract __________ the ventricles contract

Answer 10

before