Heart and circulation

Question 1

What is the route of blood in the heart?

Answer 1

• de-oxygenated blood returns via veins into right atrium
• from right atrium to right ventricle through the tricuspid valve
• from right ventricle to pulmonary trunk
• pulmonary trunk divides into pulmonary arteries to the lungs
• oxygenated blood returns in pulmonary veins to the left atrium
• from left atrium to left ventricle through the mitral valve
• from left ventricle to aorta to the rest of the body

Question 2

How does blood enter the right atrium?

Answer 2

via the superior and inferior vena cavae and the coronary sinus

Question 3

How does blood enter the left atrium?

Answer 3

via 4 pulmonary veins

Question 4

How many valves are there in the heart?

Answer 4

4 - two atrioventricular valves (mitral and tricuspid) and two semilunar (aortic and pulmonary)