The Heart

Question 1

Gap junctions in the intercalated discs of cardiac muscle cells allow the rapid passage of what?

Answer 1

Action potentials

Question 2

The ‘p’ wave on the electrocardiogram corresponds to:

Answer 2

Arterial deplorisation

Question 3

Which valve prevents the backwards flow of blood in to the left atrium?

Answer 3

Mitral valve

Question 4

The cells of the cardiac conduction system have the ability to create their own action potentials, this is known as:

Answer 4

Automaticity

Question 5

The parasympathetic nervous system innervates the heart via which cranial nerve?

Answer 5

Cranial nerve X – Vagus nerve

Question 6

What effect does increased activity in the parasympathetic nervous system have on the heart:

Answer 6

Decreased heRt rate

Question 7

Which of the following hormones increases the force of contraction of the heart chambers?

Answer 7

Thyroxine

Question 8

What sort of space exists between the parietal and visceral pericardium?

Answer 8

Virtual