Semester 2 L13 : The Cardiovascular System 2 – Electrical and Mechanical Events

Question 1

what does Excitation cause chambers to do?

Answer 1

contract

Question 2

beating of a heart allows a body to do what?

Answer 2

pump blood through the heart

Question 3

what happens first systole of diastole?

Answer 3

diastole, systole is the last stage of a heart beat.

Question 4

what is systole?

Answer 4

Action potential causes chamber to contract and eject blood

Question 5

what is Diastole?

Answer 5

when the chamber relaxes and fills with blood

Question 6

what happens in the ventricular filling phase?

Answer 6

• Atrium is diastole and is filled
• Atrioventricular valve is open with high pressure in the atrium
• The ventricle is diastole and is filling via draining
• The semilunar valve is closed and there’s high pressure in the artery

Question 7

return to

Answer 7

slide 5

Question 8

during systole blood is forced through what to what?

Answer 8

From atrium to ventricle

From ventricle to artery

Question 9

why does the heart muscle contract?

Answer 9

due to action potential running through heart

Question 10

where do action potentials start?

Answer 10

Action potential starts at the sinoatrial node

Question 11

cardiac muscle is ______.

Answer 11

striated

Question 12

what holds together cardiac myocytes ?

Answer 12

intercalated discs

Question 13

are cardiac mycocytes aligned?

Answer 13

no

Question 14

cardiac muscle has a ____ _____ per cell.

Answer 14

1. single

2. nucleus

Question 15

Individual ______ are not regularly aligned

Answer 15

sarcomeres

Question 16

what similarity does cardiac and skeletal muscle have?

Answer 16

they are both striated

Question 17

what do pacemaker cells generate?

Answer 17

electrical impulses

Question 18

what is a sarcomere?

Answer 18

section between two Z lines, and is divided into zones or bands.

Question 19

When the muscle contracts the ___ zone and ___ band _____ as the thin (actin) filaments are brought ____ together, the ___ band remains the same length.

Answer 19

1. H
2. I
3. shorten
4. closer
5. A

Question 20

Movement of ions across the plasma membrane result in what?

Answer 20

an electrical charge

Question 21

what is passive transport?

Answer 21

Diffuse down the concentration gradient

Question 22

what do ion channels and carrier proteins do?

Answer 22

Create holes in the membrane allowing movement

Question 23

does active transport go against or with the concentration gradient?

Answer 23

against the concentration gradient

Question 24

for every ATP molecule how many Na ions are pumped out and how many potassium ions are pumped in in?

Answer 24

3x Sodium ions pumped out

2x Potassium ions pumped in