Name: ______Date: ______Period: ____
SIDE 1: Read the description of the heart in the passage below
The heart is a pump, that when cut frontally, is seen to consist of four chambers. A longitudinal line of tissue, the septum, separates the heart into two halves, left and right - named for the side of the body they lie on when the heart is in place in the body. The septum effectively divides the heart into two separate pumps. The upper two chambers are called the atria (single-atrium) and the bottom two chambers, the ventricles. The function of the atria is to receive blood and pass it into the ventricles while the function of the ventricles is to discharge blood into the vessels leaving the top of the heart.
A. Using pencil, draw a representative diagram of the heart based on the information given above
B. Label your diagram with as much detail as possible.
C. Why do you think the body needs two pumps? Write a response in the space below
Read the remaining passage and add/adapt your diagram to include the new information
The right atrium receives blood from two major blood vessels, called the inferior and superior vena cava. These bring blood full of carbon dioxide from the upper and lower extremities. The left atrium receives blood from the left and right pulmonary veins. These return blood full of oxygen from the lungs.
The right ventricle pumps blood out of the top of the heart into a large vessel called the pulmonary trunk that transports blood to the lungs. The left ventricle pumps blood out of the top of the heart into the aorta. From the aorta blood is distributed to the many regions of the body.
A set of one-way valves control the flow of blood between the atria and the ventricles and another set control the exit of blood out of the heart. The first set of valves are called the atrio-ventricular (AV) valves and the second set the semi-lunar valves.
D. Add any additional information to your diagram
E. Draw arrows to show the flow of blood through the heart. Use a blue arrow to show blood that contains carbon dioxide and a red arrow to show blood containing oxygen.
F. Why does the heart have valves?
G. Use your text to find specific names given to the valves, and any additional labels for the heart, and write them below
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