Q 01/05

How many chambers does the human heart have?

A) One

B) Two

C) Four

D) Eight

Answer · why

C) Four

Four. A wall down the middle makes the heart two pumps in one: one half sends used blood to the lungs while the other sends the refreshed blood round ...

Q 02/05

What are the two upper chambers of the heart called?

A) Ventricles

B) Atria

C) Septa

D) Alveoli

Answer · why

B) Atria

Atria. The name is Latin for an entrance hall, which is roughly what they are: blood arriving at the heart collects there before being passed down to ...

Q 03/05

An adult's heart is usually described as about the size of which part of its owner's body?

A) Thumb

B) Ear

C) Foot

D) Fist

Answer · why

D) Fist

Fist. It weighs only about 300 grams, though years of hard endurance training can enlarge it, a normal change that doctors regularly see in athletes.

Q 04/05

A resting adult heart rate above 100 beats a minute is known by which medical term?

A) Bradycardia

B) Hypotension

C) Hypertension

D) Tachycardia

Answer · why

D) Tachycardia

Tachycardia. A healthy adult heart at rest beats 60 to 100 times a minute, and fitness pulls the figure down: a well-trained athlete's can idle at 40 ...

Q 05/05

Which structure acts as the heart's own natural pacemaker?

A) The bundle of His

B) The mitral valve

C) The sinoatrial node

D) The coronary sinus

Answer · why

C) The sinoatrial node

The sinoatrial node. Left to itself it would fire about 100 times a minute, but the nervous system acts as a brake and holds a resting heart to 60 to ...