Section Three (circulatory system)

Question 1

Which blood vessel has a thick muscle layer?

Answer 1

Arteries.

Question 2

Which blood vessel has a thinner muscular layer?

Answer 2

Veins.

Question 3

Which blood vessel has a wider lumen?

Answer 3

Veins.

Question 4

Which blood vessel has a narrow lumen?

Answer 4

Arteries.

Question 5

Which blood vessel has valves?

Answer 5

Veins.

Question 6

Which blood vessel transports blood at high blood pressure?

Answer 6

Arteries.

Question 7

Which blood vessel transports blood at low blood pressure?

Answer 7

Veins.

Question 8

Which blood vessel transports blood away from the heart?

Answer 8

Arteries.

Question 9

How many cells wide are capillaries?

Answer 9

One.

Question 9

True or false: a one cell thick wall in the capillary decreases the rate of diffusion of gases.

Answer 9

False.

Question 9

What surface area do capillaries have?

Answer 9

Large.

Question 10

Which blood component is a yellow liquid?

Answer 10

Plasma.

Question 11

State one substance that is dissolved in blood plasma?

Answer 11

Hormones.

Question 12

Which blood component clots blood?

Answer 12

Platelets.

Question 13

Which cell component engulfs pathogens?

Answer 13

Phagocytes.

Question 14

Which molecule does oxygen bind to inside the red blood cell?

Answer 14

Haemoglobin.

Question 15

Which shape does a red blood cell have?

Answer 15

Biconcave shape.