E4: CH 14

Question 1

BP ___ over increased distance from the heart

Answer 1

decreases

Question 2

The pressure created when the ventricles contract is called the ___ ___ for blood flow

Answer 2

driving pressure

Question 3

which of the following factors has the greatest effect on blood resistance:
length of vessel
radius of vessel
blood viscosity

Answer 3

radius of vessel

Question 4

If resistance increases, flow rate ____

Answer 4

decreases

Question 5

Fluid flow through a tube is proportional to the __ __

Answer 5

pressure gradient

Question 6

At a constant flow rate, the velocity of flow through a small tube is ___ than the velocity through a larger tube.

Answer 6

faster

Question 7

The signal for contraction originates in ___ cells in the heart.

Answer 7

autorhythmic

Question 8

Myocardial cells are linked to one another by __ __ that contain gap junctions.

Answer 8

intercalated disks

Question 9

Action potentials originate at the __ node

Answer 9

SA

Question 10

trace heart electrical impule

Answer 10

SA node, internodial pathway, AV node, AV bundle, bundle branches, prukinje fibers, myocardial contractile cell

Question 11

P wave represents atrial ___

Answer 11

depolarization

Question 12

The T wave represents ventricular ___

Answer 12

repolarization

Question 13

The QRS complex represents ventricular ___

Answer 13

depolarization

Question 14

the closing of what values creates the first heart sound

Answer 14

AV

Question 15

List three functions of the cardiovascular system.

Answer 15

transport of materials entering and leaving the body, defense, and cell-to-cell communication

Question 16

If vasodilation occurs in a blood vessel, pressure (increases/decreases).

Answer 16

decreases

Question 17

What events cause the two principal heart sounds?

Answer 17

AV closure and semilunar valve closure