Quiz 4

Question 1

_between fibers in unitary smooth muscle make it a functional Syncytium

Answer 1

Gap junctions

Question 2

_activity in unitary smooth muscle is the result of leaky cell membranes?

Answer 2

Pacemaker activity

Question 3

What channels in myocardial cells produce a plateau phase in the action potentials of these cells? This results in a very long action potential ___ms

Answer 3

1. Calcium

2. 250ms

Question 4

During the ventricular contraction phase of the cardiac cycle, the pressure in the ventricle increases above the pressure in the _______causing semi-lunar valve to _____

Answer 4

1. Arterial causing semilunar valve to open

Question 5

Starling’s Law of the heart states that an increase in end diastolic volume will result in an increase in

Answer 5

Stroke volume

Question 6

What are three variables that can be altered in the Baroreceptor Reflex to control blood pressure (think Ohm’s Law)?

Answer 6

Pressure = flow x resistance

1. Stroke volume
2. Heart Rate
3. Total Peripheral Resistance

Question 7

According to the process of autoregulation an increase in CO2 in interstitial fluid will result in an

Answer 7

Vasodilation

Question 8

__ and __ are two mechanisms functioning in capillaries that make them exchange vessels

Answer 8

1. Bulk flow

2. Diffusion

Question 9

_ is the measurement of the packed cell volume of the blood (about 45%)

Answer 9

Hematocrit

Question 10

_are the most numerous formed elements found in the blood

Answer 10

Erythrocytes

Question 11

___ (type not example)smooth muscle is a functional Syncytium

Answer 11

Unitary/visceral

Question 12

What are the twitch times for the following types of muscle? Smooth
Cardiac
Skeletal

Answer 12

Smooth muscle 3000ms

cardiac muscle 300ms

Skeletal muscle 100ms

Question 13

Type__skeletal muscle fibers are fast oxidative and red

Answer 13

Type??

Question 14

__refers to the increase in skeletal muscle cross sectional are that results from an increase in the number of muscle fibers

Answer 14

?

Question 15

Thea heart has a prolonged action potential due to the presence of

Answer 15

?

Question 16

According to ohm’s law: Mean arterial pressure= _____ x Total Peripheral Resistance

Answer 16

?

Question 17

Starling’s Law of the heart states that stroke volume will increase with an increase in ___ volume.

Answer 17

End diastolic volume

Question 18

___ are the vascular structures that regulate resistance

Answer 18

Arterioles

Question 19

During the passive filling phase of the cardia cycle the pressure in the atria is greater than the pressure in the ___(location).

The passive filling of the heart creates the ___ (#) heart sound

Answer 19

Ventricles

3rd heart sound