Question 1

Which structure is labeled 'a' in the first heart diagram, and what is its primary function?

Accepted Answer

Aorta; carries oxygen-rich blood from the left ventricle to the systemic circulation

Question 2

In the third image, which vessel is labeled 'E' and what is its significance in coronary circulation?

Accepted Answer

Circumflex artery; supplies the left atrium and posterior walls of the left ventricle

Question 3

Refer to the fourth image (pacemaker cell action potential). What ion movement is primarily responsible for the phase labeled '2'?

Accepted Answer

Influx of calcium ions

Question 4

In the fifth image (contractile cardiac muscle cell action potential), what is the physiological significance of the plateau phase labeled '2'?

Accepted Answer

It ensures a long refractory period, preventing tetanic contractions.

Question 5

In the conduction system diagram (image 6), what is the function of the structure labeled '1'?

Accepted Answer

Sinoatrial (SA) node; initiates the heartbeat and sets the pace for the heart

Question 6

The green-highlighted wave in the ECG tracing (image 7) corresponds to which event?

Accepted Answer

QRS complex; ventricular depolarization

Question 7

In the lymphatic capillary diagram (image 8), what is the role of the anchoring filaments?

Accepted Answer

They attach endothelial cells to surrounding tissue, preventing collapse and facilitating fluid entry.

Question 8

In the lymphatic system diagram (image 9), which organ is labeled 'B' and what is its primary function?

Accepted Answer

Red bone marrow; site of hematopoiesis and B cell maturation

Question 9

In the lymph node diagram (image 10), what is the significance of having fewer efferent than afferent lymphatic vessels?

Accepted Answer

It slows the flow of lymph, allowing more time for immune surveillance and filtration.

Question 10

In the spleen histology diagram (image 11), which region is labeled 'E' and what is its function?

Accepted Answer

White pulp; site of immune functions and lymphocyte proliferation

Question 11

Which structure in the first heart diagram (image 1) is responsible for receiving oxygen-poor blood from the body?

Accepted Answer

d (Right atrium)

Question 12

In the conduction system diagram (image 6), what is the importance of the delay at the structure labeled '2'?

Accepted Answer

It allows the atria to finish contracting before the ventricles contract.

Question 13

Which vessel in the third heart diagram (image 3) is responsible for draining venous blood from the myocardium into the right atrium?

Accepted Answer

F (Coronary sinus)

Question 14

Which phase of the cardiac cycle is associated with the closing of the atrioventricular (AV) valves, and what heart sound does this produce?

Accepted Answer

Isovolumic contraction; 'lub' sound

Question 15

Which of the following best describes the function of the white pulp in the spleen (image 11)?

Accepted Answer

It is the site of immune functions and contains lymphocytes.

Study Guidance: Heart Chambers and Associated Vessels

Study Guide - Practice Questions