Cardiac Valves

Question 1

What do cardiac valves do?

Answer 1

They prevent the backflow of blood in the heart and ensure that blood only flows through the heart in one direction

Question 2

How many cardiac valves are there?

Answer 2

Four

Question 3

What are the two types of cardiac valves?

Answer 3

Semilunar

Cuspid

Question 4

What are the two types of semilunar cardiac valves?

Answer 4

Pulmonary

Aortic

Question 5

What are the two types of cuspid valves?

Answer 5

Tricuspid

Bicuspid

Question 6

What is another name for the bicuspid valve?

Answer 6

Mitral

Question 7

Where is the tricuspid valve situated?

Answer 7

Between the right atrium and the right ventricle

Question 8

How many flaps does the tricuspid valve have?

Answer 8

Three

Question 9

How are the flaps of the cuspid valves attached to the inner walls of the cardiac muscle?

Answer 9

By the chordae tendinae

Question 10

What are chordae tendinae?

Answer 10

Inelastic tendons which attach to papillary muscles

Question 11

What are papillary muscles?

Answer 11

Small protrusions on the inside wall of the ventricles

Question 12

How does a cuspid valve open?

Answer 12

When the atrium contracts
Blood flows through
Pushes the valve open

Question 13

How do the cuspid valves close?

Answer 13

When the ventricle contracts, blood pushes against the bottom of the flaps and closes them

Question 14

What prevents the cuspid valves from being pushed back into the atrium?

Answer 14

The papillary muscles contract
The chordae tendinae are pulled tight
This prevents the flap from opening backwards

Question 15

Where is the mitral valve situated?

Answer 15

In the opening between the left atrium and the left ventricle

Question 16

How many flaps does the mitral valve have?

Answer 16

Two

Question 17

Where does the pulmonary semilunar valve occur?

Answer 17

At the base of the pulmonary artery

Question 18

Where does the aortic semilunar valve occur?

Answer 18

At the base of the aorta

Question 19

What do semilunar valves look like?

Answer 19

Half-moon-shaped membranous pockets

Question 20

Where do the free ends of the semilunar valves point?

Answer 20

Away from the ventricles

Question 21

How do the semilunar valves open?

Answer 21

When the ventricles contract

Blood pushes the flaps flat against the artery walls and the valves are open

Question 22

How do semilunar valves close?

Answer 22

Ventricles relax
Blood flows back
Fills the pockets
They push against each other 
The valves close