Take this Exam: GCSE Biology: Heart, Blood and Circulation | Zestly

Question 1

Which blood vessel type is characterized by having walls that are only one cell thick, facilitating the exchange of materials between blood and tissues?

Accepted Answer

Capillaries

Question 2

What is the main role of plasma in the blood?

Accepted Answer

To act as a transport medium for dissolved substances like glucose, carbon dioxide, and hormones.

Question 3

Which of the following are potential disadvantages associated with the use of stents in treating coronary heart disease?

Accepted Answer

Risk of infection during the surgical procedure.

Question 4

How do red blood cells adapt to maximize their efficiency in transporting oxygen?

Answer

They have a biconcave disc shape to increase surface area.

Answer

They contain haemoglobin which binds to oxygen.

Answer

They lack a nucleus to provide more space for haemoglobin.

Answer

They have thick walls to withstand high pressure.

Question 5

In the context of the heart, what is the function of the valves located between the atria and the ventricles?

Answer

To increase the pressure of the blood entering the ventricles.

Answer

To prevent the backflow of blood into the atria when the ventricles contract.

Answer

To direct blood into the pulmonary artery.

Answer

To separate oxygenated and deoxygenated blood.