Module 8 ML-3

Question 1

Three types of cardiac muscle cells

Answer 1

pacemaker
conducting
contractile

Question 2

Pacemaker

Answer 2

a small fraction of cardiac muscle cells that have automaticity (automatically generates an AP); SA node determines the heart rate

Question 3

SA node APs/min

Answer 3

100/120

Question 4

AV node APs/min

Answer 4

60-80 APs/min

Question 5

Conducting cells

Answer 5

30-50 APs/min

Question 6

Conducting cells

Answer 6

all cardiac muscle cells are conducting cells because they all conduct APs, a small amount are specialized to rapdily spread the electrical stimulus to the chambers

Question 7

What are the conducting cells

Answer 7

Bundle of His, right and left bundle branches and Purkinje fibers

Question 8

Contractile Cells

Answer 8

99% of cardiac muslce cells whose activity allows blood to be pumped out of the heart

Question 9

Coronary arteries

Answer 9

the first branches off the aorta and their openings rae behind aortic valve cusps

Question 10

What provides oxygen and nutrients to the heart muscle cells?

Answer 10

coronary capillaries

Question 11

What returns blood back to the right atrium

Answer 11

coronary veins

Question 12

How many miles of blood vessels are in your body

Answer 12

60,000-100,000

Question 13

What is the ultimate function of the circulatory system

Answer 13

ensure adequate blood flow through capillaries of various organs

Question 14

What is the path of blood

Answer 14

-right ventircle
-pulomnary valve (SL)
-pulomonary trunk
-pulmonary arteries
-pulmonary arterioles
-capillaries of lungs
-pulomary venules
-pulmonary veins
-left atrium
-left AV valve
-let ventricle
-Aortic valve (SL
-Aorta
-arteries
arterioles
-capillaries
-venules
-veins
-venae cavaw
-right atrium
-right AV valve

Question 15

Vasoconstriction

Answer 15

small redius, high resistance, low flow

Question 16

Vasodilation

Answer 16

big radius, low resistance, high flow

Question 17

Atria

Answer 17

chambers through which blood flows from veins to ventricles
-receive blood from veins
-contraction addes to ventricular filling but not essential

Question 18

Ventricles

Answer 18

chambers whose contractions produce the pressures that drive blood through the pulmonary and systemic vascular systems and back to the heart

Question 19

arteries

Answer 19

-low resistance tubes conducting blood flow to organs

Question 20

Arterioles

Answer 20

major sites of resistance to flow, regulate the pattern of blood flow distribution to the various organs

Question 21

Capillaries

Answer 21

major site of exchange

Question 22

Venules

Answer 22

sites of migration of leukocytes from the blood into tissues

Question 23

Veins

Answer 23

low resistance high capacity vessels carrying blood back to the heart

Question 24

What is the purpose of heart valves

Answer 24

to promote one way direction of blood flow

Question 25

AV valves

Answer 25

Right and left AV valve

Question 26

Semilunar valves

Answer 26

pulmonary semilunar valve and the aortic semilunar valve

Question 27

High pressure and volume in the atrium

Answer 27

valve opens and blood goes into the ventricle

Question 28

High pressur and volume in ventricle and little pressure and volume in atrium

Answer 28

valve closed

Question 29

High pressure and volume in ventricle and no pressure in atrium

Answer 29

blood goes into atrium

Question 30

Normal open valve

Answer 30

laminar flow (quiet)

Question 31

Normal closed valve

Answer 31

no flow (quiet)

Question 32

Stenotic valve (poor opening)

Answer 32

narrowed valve, turbulent backflow = murmur=gurgle

Question 33

Inapproporiate volume leads to

Answer 33

abnormally high pressure

Question 34

Insufficient valve (poor closing)

Answer 34

leaky valve
-turbulent backflow=murmur=gurgle

Question 35

Lub

Answer 35

AV closing

Question 36

Dub

Answer 36

SL closing

Question 37

Lub Whistle dup

Answer 37

steno and SL

Question 38

Lub Gurgle Dup

Answer 38

Insuff and AV

Question 39

Lub Dup Whistle

Answer 39

Steno and AV

Question 40

Lub Dup Gurgle

Answer 40

Insuff and SL