Circulatory System 2

Question 1

Oxygen + Glucose —> ?

Answer 1

water and carbon dioxide

Question 2

Explain why oxygen uptake increases as an athlete runs at faster speed

Answer 2

• muscles contract more

- more aerobic respiration for more energy

Question 3

Explain how higher cardiac output after 4 weeks of training increases the rate of aerobic respiration

Answer 3

• more blood per minute / faster blood flow

- more oxygen transported to muscle

Question 4

State 2 ways in which the structure of a yeast cell differs from the structure of a bacterial cell

Answer 4

• yeast cell has a nucleus
• yeast cell doesn’t have a flagellum
• bacterial cell has chromosomal DNA

Question 5

Suggest why yeast cells cannot produce glucose

Answer 5

• they do not have chloroplasts

Question 6

Describe function of a white blood cell

Answer 6

• involved in the defence against disease as part of the immune system
• produce antibodies

Question 7

yangyang has a low number of red blood cells compared to a healthy person

suggest an effect this may have on yangyang

Answer 7

lack of energy and feeling tired

Question 8

Cardiac Output - Graph Q

Answer 8

36

Question 9

When the heart rate is at its maximum the concentration of lactic acid in the blood is…?

Answer 9

B - 12.8

Question 10

The graph shows that…

Answer 10

D - the concentration of lactic acid is not dependent on heart rate

Question 11

Explain why concentration of lactic acid changes at running speeds greater than 18kmh

Answer 11

• lactic increases as exercise increases
• muscles contracting faster
• aerobic respiration is at maximum rate
• oxygen not supplied fast enough
• anaerobic respiration occurs producing lactic acid

Question 12

After running the person rested.

Explain why the concentration of lactic acid in the blood changes whilst resting.

Answer 12

• concentration of lactic acid decreases
• lactic acid breaks down
• using oxygen
• into carbon dioxide and water