Biology Heart Quiz

What causes heart ventricles to fill with blood?

A. Atrial contraction, I only

What is the function of thrombin in the process of blood clotting?

A. It acts as a catalyst.

In which blood vessel connected to the heart does blood have the lowest carbon dioxide concentration?

A. Pulmonary vein

What are the conditions of the blood travelling through the pulmonary vein?

A. high, low, low

What helps to keep blood flowing onwards away from the heart in an artery?

B. Elastic fibres

Which is an explanation of the processes happening?

B. In phase II, pressure rises in the aorta because the left ventricle is contracting.

What causes the rate of heart contraction to increase or decrease?

B. Nerve impulses from the brain

What is a feature of the human circulatory system?

B. The pulmonary artery and vena cava both carry deoxygenated blood.

What is a role of the coronary arteries?

B. To supply the heart muscle with oxygen and nutrients

What is dissolved in blood plasma?

B. amino acids, glucose and urea

What is the position of heart valves when blood pressure is highest in the aorta?

B. closed, open

Which is a valid comparison between arteries and veins

C. Blood flows at high pressure, blood flows at low pressure

What is a role of the coronary arteries?

C. To supply the heart muscle with nutrients

The diagram shows the human heart. Which shows the sequence of blood flow in the heart?

C. VII VIII I

When the left ventricle is relaxed, what is the state of the valves?

C. open, closed

What is a correct pathway for blood flowing through the heart?

C. right atrium, tricuspid valve, right ventricle, pulmonary artery

What structures are indicated by the labels X, Y and Z?

C. right, pulmonary, semilunar

What is the role of the pacemaker (SAN)?

D. It changes the frequency of muscle contraction in the heart.

What is a feature of the left atrium?

D. Its pressure decreases as the left ventricle fills up.

What is the structure labelled X?

D. Left ventricle

What is a similarity between arteries and capillaries?

D. Neither has valves.

Which discovery was an indication that the heart pumps blood to the body through arteries?

D. The heart swelled up when the arteries were tied in an animal experiment

What is the state of the atrio-ventricular and semilunar valves when the left ventricle contracts?

D. closed, open