Heart

Question 1

What is ECG?

Answer 1

An instrument used to monitor electric activity of the heart. It records potential changed produces by the cardiac muscle fibers.

Question 2

Explain what systole is

Answer 2

The depolarization of the cardiac muscle cells, which makes them contract.

Question 3

What is systolic pressure?

Answer 3

The force that makes the blood flow of the body from the heart. Systolic pressure is the first number measured in bloodpressure. Normal systolic pressure is below 120.

Question 4

Explain what diastole is

Answer 4

Happends after systole, it is the repolarization of the cardiac muscle clls, which makes them relax.

Question 5

What is diastolic pressure?

Answer 5

“minimum” blood pressure. Relaxing.

Question 6

What is arterial mean pressure?

Answer 6

The average blood pressure during a single cardiac cycle.

Question 7

What is puls-pressure?

Answer 7

The difference between systolic and diastolic pressure readings. Reprecent the force the heart generates each time it contracts.

Question 8

What is brainbridge reflex?

Answer 8

Also called atrial reflex, is an increase in heart rate due to increase in central venous pressure

Question 9

What is the baroreceptor reflex?

Answer 9

reflex that can regulate the blood pressure.

Question 10

What is the peripheral resistance?

Answer 10

The resistance of arteries to blood flow. As arteries constrict, the resticance increases as the dialate resistance decreases.

Question 11

What is cardiac output?

Answer 11

The total volume of blood being pumped from the ventricle in one minute. (speed of bloodflow through the body) stroke volume * heart rate

Question 12

What is heart rate?

Answer 12

Number of heartbeats per minute

Question 13

What is stroke volume?

Answer 13

Volume of blood leaving the heart via the aprta. (can only be measured with ultrasound of the heart)

Question 14

What is the sack the heart lays in called?

Answer 14

Pericardium

Question 15

Explain the difference between arteries and veins

Answer 15

Arteries pumpes blood out of the heart

Veins pumpes the blood back into the heart

Question 16

Name some of the hearts most important tasks

Answer 16

Transporting nutrience to the body
Transporting oxygen
Regulating heat
Transporting toxins and gases out of the body

Question 17

Define Respiratory sinus arrhythmia

Answer 17

the way the heart rate varies in synch with respiration. The rate is faster on inspiration, and decreases on expiration.

Question 18

Define Ventricular diastole

Answer 18

The period during which the ventricles are filling and relaxing

Question 19

Define Atrial diastole

Answer 19

The period during which the atria are relaxing

Question 20

Define Ventricular systole

Answer 20

Contraction of the ventricles, forcing blood into the aorta and pulmonary artery.

Question 21

Define Atrial systole

Answer 21

Contraction of the atria by which blood is forced into the ventricles. Indicated by the fourth heart sound. (indicated electrically by the P wave)

Question 22

Define blood pressure

Answer 22

The pressure of circulating blood on the walls of blood vessels