Chapter 15 Physiology of Cardiovascular System Flashcards Preview

Anatomy and Physiology II Lab > Chapter 15 Physiology of Cardiovascular System > Flashcards

Flashcards in Chapter 15 Physiology of Cardiovascular System Deck (19):
1

Lupp/Lubb

long, soft sound made when AV close

2

Dupp/Dubb

short, loud sound made when SV close

3

Murmur

abnormal swishing sound, occurs when valves don't close completely and blood leaks into chamber.

4

Blood Pressure

the pressure blood exerts on its containing vessels.

5

Systole

blood exits heart, contraction

6

Diastole

blood enters heart, relaxation

7

Systolic Pressure

pressure generated by blood exiting the heart
100-140 mmHg

8

Diastolic Pressure

pressure generated by blood entering the heart 70-90 mmHg

9

hypertension

high blood pressure

10

Cardiac Output=

stroke volume x heart rate

11

Stroke Volume=

end diastolic volume + end systolic volume

12

mechanical activities

breathing, heart sounds, pulse, blood pressure

13

Effect of Exercise of Heart

increases HR, blood pumping faster; using oxygen more quickly, must pump oxygen to body faster and more frequently.

14

Effect of Cold Stimulus on Heart

HR increases in cold temperatures because it must pump faster to maintain core temperature. Needs to ensure blood gets to heart and other vital organs; during hypothermia body will stop pumping blood to extremities and only pump to vital organs (survival mode)

15

P Wave

atrial depolarization, represents the immediate excitation that follows atrial contraction.

16

QRS Complex

ventricular depolarization, electrical activity that immediately proceeds ventricular depolarization with atrial depolarization (hidden by ventricular depolarization)

17

T Wave

Repolarization of ventricles.

18

Analyzing EKG

depresssed S-T segment= heart attack

abnormally long QRS Complex= muscle fibers are not receiving electrical signal which could alter contraction of ventricles.

19

Conduction System

1. Electrical signal initiates at SV Node.
2. Signal travels throughout atria causing contraction.
3. Signal reaches AV Node through gap junctions and is delayed to allow atria to finish contracting.
4. Signal travels from left and right AV bundles and the to purkinje fibers.
5. Purkinje fibers spread the signal throughout ventricles resulting in ventricular contraction.