Mass Transport In Humans

Question 1

Label the heart?

Answer 1

https://www.tes.com/teaching-resource/the-heart-ocr-as-a-level-biology-11818482

Question 2

What happens when blood enters the atrium? (4)

Answer 2

• Blood volume increases so pressure increases
• Pressure in atrium is higher than ventricle
• Atrioventricular valve opens
• Atrium muscles contract

Question 3

Meaning of:
- Systole
- Diastole

Answer 3

• Contraction of heart muscle
• Heart muscle relaxes

Question 4

Equation for cardiac output?

Answer 4

Stroke Volume x Heart Rate

Question 5

Coronary Heart Disease Sheet

Answer 5

Just Put As 5

Question 6

Explain the role of the heart in the formation of tissue fluid?

Answer 6

Contraction of ventricle produces high blood pressure to force water/fluid out of the capillary

Question 7

Lymphoedema is a swelling in the legs which may be caused by a blockage in the lymphatic system.

Suggest how a blockage in the lymphatic system could cause Lymphoedema.

Answer 7

Excess fluid tissue builds up

Question 8

Explain 5 ways in which the structure of the aorta is related to its function?

Answer 8

• Elastic tissue to allow stretching + recoiling
• Muscle for contraction
• Thick walls to withstand pressure
• Smooth endothelium reduces friction
• Semi-lunar valve prevents backflow

Question 9

Explain how arteriole can reduce blood flow to capillaries?

Answer 9

Muscle contracts which narrows lumen

Question 10

Describe how tissue fluid is formed + returned to the circulatory system? (6)

Answer 10

FORMATION
- High blood/hydrostatic pressure
- Forces water/fluid out
- Large proteins remain in capillary

RETURN
- Lowers water potential in capillary
- Due to proteins
- Water enters capillary by osmosis