Heart Rhythm

Question 1

What factors increase heart rate? Name at least 4

Answer 1

1. low blood ph (working out)
2. low oxegen in blood
3. adrenaline
4. high body temp
5. some drugs - cocaine, caffiene, alcohol

Question 2

What slows down heart rate? Name at least 3 things.

Answer 2

1. Lots of blood in aorta
2. low body temp
3. drugs - heroin/opium

Question 3

Explain blood pressure

Answer 3

The force of the blood against the walls of the blood vessels.

Question 4

Factors responsible for blood pressure (CEAB)

Answer 4

1. Contraction of ventricles
2. Elasticity of artery walls
3. Artery diameter (large = low / small = high)
4. Blood volume (low blood = low pressure / high blood = high pressure)

Question 5

Explain vasodialation (what happens to the blood vessles?)

Answer 5

Blood vessels dialate to lower BP

Question 6

Explain Vasoconstriction (what happens to the blood vessels)

Answer 6

They constrict - get smaller - to raise BP

Question 7

What is the ideal blood pressure measurement?

Answer 7

120 (systolic) / 80 (diastolic)

Question 8

Explain cardiac output

Answer 8

The amount of blood pumped out each minute (SV)

Question 9

what does heart rate measure?

Answer 9

Number of beats per minutes (HR)

Question 10

What is the equation for cardiac output?

Answer 10

CO=SVxHR

Question 11

Does a fit person have higher or lower SV?

Answer 11

Higher