The Heart and Circulatory System –
How they Work YouTube Video/Notes
Video: https://www.youtube.com/watch?v=CWFyxn0qDEU
1. Your heart is about the size of your ___________.
2. It is divided into right and left sides to protect ________________________
blood from mixing with ________________________ blood.
3. Your heart pumps about ________________________ of blood every minute
and beats about ________________________ each day. That is about
________________________ in a year.
4. Oxygen poor blood or “____________ blood”, returns to the heart after
circulating the body through the right / left (circle one) side of the heart.
5. The right atrium and right ventricle collect and pumps the blood to the
___________ through the __________________ arteries.
6. The lungs supply the blood with a fresh supply of _______________, making it
turn ________.
7. Oxygen rich blood or “________ blood”, enters the
(circle one) side of the heart.
right / left
8. The left atrium and left ventricle pump the blood through the _________ to the
rest of the body.
9. ________ valves in the heart keep your blood pumping the right way. They are
the Tricuspid, Mitral, Pulmonary and Aortic.
10.Valves work like a __________ on a fence. They open only one way and only
when they are _______________ on. Each valve opens and closes
___________ per heartbeat.
11.Contraction is called __________________ and
called __________________.
Relaxation is
12.During systole, the ventricles __________________ and force blood into the
vessels. The ______________ ventricle contracts slightly before the
______________ ventricle.
13.During diastole, the ventricles _______________ and fill with blood coming
from the upper chambers which are called the left and right __________.
14.Blood vessels called ____________________ arteries extend over the surface
of the heart and branch into smaller capillaries.
15.Electrical impulses begin high up in the ____________ ____________ and
travel through specialized pathways delivering the signal to ________.
16.The ______________________ system keeps your heart beating in a normal
and coordinated rhythm.
VIDEO/NOTES ANSWER KEY
1. Your heart is about the size of your fist.
2. It is divided into right and left sides to protect oxygen poor blood from mixing
with oxygen rich blood.
3. Your heart pumps about 5 quarts of blood every minute and beats about
100,000 times each day. That is about 35 million beats in a year.
4. Oxygen poor blood or “blue blood”, returns to the heart after circulating the
body through the right / left (circle one) side of the heart.
5. The right atrium and right ventricle collect and pumps the blood to the lungs
through the pulmonary arteries.
6. The lungs supply the blood with a fresh supply of oxygen, making it turn red.
7. Oxygen rich blood or “red blood”, enters the right / left (circle one) side of the
heart.
8. The left atrium and left ventricle pump the blood through the aorta to the rest of
the body.
9. Four valves in the heart keep your blood pumping the right way. They are the
Tricuspid, Mitral, Pulmonary and Aortic.
10.Valves work like a gate on a fence. They open only one way and only when
they are pushed on. Each valve opens and closes once per heartbeat.
11.Contraction is called systole and Relaxation is called diastole.
12.During systole, the ventricles contract and force blood into the vessels. The
right ventricle contracts slightly before the left ventricle.
13.During diastole, the ventricles relax and fill with blood coming from the upper
chambers which are called the left and right atria.
14.Blood vessels called coronary arteries extend over the surface of the heart and
branch into smaller capillaries.
15.Electrical impulses begin high up in the right atrium and travel through
specialized pathways delivering the signal to pump.
16.The conduction system keeps your heart beating in a normal and coordinated
rhythm.