Heart Structure and Chambers

Questions and Answers

2.5 billion (correct)

1 billion

10 billion

5 billion

To control the flow of blood from one chamber to another (correct)

To filter the blood

To pump blood through the heart

To mix oxygen-rich and oxygen-poor blood

In both directions

Only in one direction (correct)

Randomly

None of the above

Right atrium Signup and view all the answers

Lub-DUB Signup and view all the answers

Heart Signup and view all the answers

To allow blood to flow from the left atrium to the left ventricle Signup and view all the answers

The order of the blood flow cycle Signup and view all the answers

It is pumped out to the rest of the body Signup and view all the answers

The lungs Signup and view all the answers

Study Notes

The heart is approximately the size of a fist and beats around 2.5 billion times in a lifetime.
It is composed of several smaller parts, including chambers and valves, which work together to pump blood.

The heart has four chambers, similar to rooms in a house, with two chambers sitting atop the other two.
The upper chambers are the atria, and the bottom chambers are the ventricles.
There is a right atrium and ventricle, as well as a left atrium and ventricle.

The chambers are separated by valves, which control the flow of blood from one chamber to another and to the rest of the body.
Valves open and close, making a noise similar to 'lub-DUB', which is the sound of the heartbeat.
Heart valves only open in one direction, directing the flow of blood through the heart.

Blood has two forms: oxygen-poor and oxygen-rich.
Oxygen-poor blood from the body flows into the right atrium, then passes through a valve into the right ventricle.
The right ventricle pumps the blood through another valve to the lungs, where it picks up oxygen.
The oxygen-rich blood returns to the left atrium, then passes through another valve to the left ventricle.
The left ventricle pumps the oxygen-rich blood out to the rest of the body.
The cycle starts again with the oxygen-poor blood returning to the heart.
A helpful way to remember the blood flow cycle is with the phrase 'Be Ready to Read Long Love Letters', which represents the sequence: Body, Right atrium, Right ventricle, Lungs, Left atrium, Left ventricle, and back to the Body.