Mass Transport: The Heart and the Blood

The diagram shows a section through the mammalian heart. What is the name of the chamber labelled X?

• Right ventricle

• Left atrium

• Right atrium

• Left ventricle

Where in the heart is the sinoatrial node (SAN), which acts as the pacemaker, located?

• At the apex of the heart

• Beside the tricuspid valve between the right atrium and the right ventricle

• Between the atria and the ventricles

• In the wall of the right atrium

The diagram shows a section through a mammalian heart. Which of these situations would cause the valve labelled V in the diagram to open?

• When pressure in the right atrium is greater than the pressure in the right ventricle.

• When pressure in the pulmonary vein is greater than the pressure in the right ventricle.

• When pressure in the right ventricle is greater than the pressure in the right atrium.

• When pressure in the pulmonary artery is greater than the pressure in the right ventricle.

Name the blood vessel labelled C on the diagram of the heart.

• Vena cava

• Pulmonary vein

• Aorta

• Pulmonary artery

The graph shows dissociation curves for four different animals living in different environments. Which curve would represent the animal living in the most oxygen depleted environment?

• A

• B

• C

• D

Complete the equation for cardiac output:

Cardiac output =

• Heart rate / stroke volume

• Stroke volume / heart rate

• Heart rate x stroke volume

• Stroke volume + heart rate

Which type of blood vessel has the thickest muscle layer?

Which type of blood vessel contains valves to prevent back flow?

Which statement is incorrect?

• Capillaries have a narrow lumen.

• Capillaries are numerous and highly branched.

• Capillaries have a thin elastic layer.

• Capillaries have spaces in their lining to allow WBCs to move into tissues.

True or False?

The arterial end of a capillary is under high hydrostatic pressure.

• True

• False