lab 8 cardiovascular physiology

Question 2

Steps of baroreceptors

Answer 2

1. detect the degree of stretch in arteries and transmit signals to the vasomotor center
2. vasomotor center integrates input
3. outgoing signals are carried by sympathetic nerves in blood vessels
4. blood vessels constrict or dilate to adjust blood pressure.

Question 3

SA Node is what and located where

Answer 3

is the pacemaker (stimulus)
located at the top of the right atrium.

Question 4

AV node (atrioventricular node) is located where

Answer 4

the left side of the right atrium

Question 5

Bundle of HIS is what and where in the heart

Answer 5

Atriovascular bundle and located in the septum of the heart

Question 6

What does bundle of HIS lead to?

Answer 6

Rgt and lft bundles and to the Prkinje fibers

Question 7

What is the condition pathway

Answer 7

SA node (pacemaker)
AV node
Bundle of HIS
rgt and lft bundle branches
enter ventricles

Question 8

what is the pacemaker and how does it contract the heart.

Answer 8

Sinoatrial node = pacemaker

superior vena cava and right atrium
regulates the heart beat

Question 9

ECG” what waves are included and what happens (general)

Answer 9

P-wave: atria contract (arteries)
QRS wave : ventricles contract
T-wave: all 4 chambers relax

Question 10

ECG: complex process

Answer 10

P-wave: depolarization of the atria
QRS: depolarization of the ventricles, atria repolarization
T-wave: Repolarization of ventricles

Question 11

What does an ECG do?

Answer 11

is records the electrical changes during the respiratory cycle.

Question 12

Define Depolatization (ECG)

Answer 12

loss of an electrical charge

Question 13

Define Repolarization (ECG)

Answer 13

Return of resting potential

Question 14

Define Blood Pressure

Answer 14

The pressure exerted by blood against the walls of vessels (pressure waves that travel through the blood – pulse)

Question 15

What pressure is this?
Created by contraction of ventricles and measured in brachial atery and reported as systolic/dialstolic

Answer 15

Creates blood pressure

Question 16

Define Systolic Pressure:

Answer 16

Pressure when the heart contracts

Question 17

Type: Pressure when the heart contracts

Answer 17

Systolic Pressure

Question 18

Define Diastolic Pressure:

Answer 18

The pressure that is in the arteries when the heart rests b/w heart beats

Question 19

Type: The pressure that is in the arteries when the heart rests b/w heart beats
the heart is at rest

Answer 19

Diastolic Pressure

Question 20

Describe how blood pressure and heart rate change when changing body positions and with exercise.

Answer 20

When muscles are active, they need more blood pressure. aka, blood flow to replace it

Question 21

What does blood pressure and heart rate + exercise compensate

Answer 21

1. increasing respiratory rate / depth
2. Vasodilation
3. Decrease resistance in active tissues, increase sympathetic activity (increase C02)

Question 22

This is what ?

It is regulated in the autonomic nervous system. That has a constant change in the sympathetic activity that changes blood pressure to maintain homeostasis

Answer 22

Barorecptors

Question 23

It sends impulses to the cardiac control center in the medulla oblongata that regulates the impulses to the heart also homeostasis

Answer 23

Baroreceptors

Question 24

Define Parasympathetic impulses:

Answer 24

Decrease heart action

Question 25

Define: Sympathetic impulses

Answer 25

increase in heart action

Question 26

What are baroceptors, and where are they located?

Answer 26

Are Sensitive fibers that are in the aortic arch. (detect changes in blood pressure)
located: Cardia control center
medulla oblongata

Question 27

Where are carotid baroreceptors located

Answer 27

neck above the aorta