Circulatory System Study Guide

Cardiovascular
The body system that consists of the heart, blood vessels, and blood: also called the circulatory system.

Heart
A hollow muscular organ that pumps blood throughout the body.

Atrium
Each of the two upper chambers of the heart that receives blood that comes into the heart.

Ventricle
Each of the two lower chambers of the heart that pumps blood out of the heart.

Aorta
The largest artery in the body; receives blood from the left ventricle.

Septum
Wall of tissue seperating the right side of the heart from the left.

Pacemaker
A group of cells located in the right atrium that sends out signals that make the heart muscle contract and that regulates heart rate.

Arteries
Blood vessel that carries blood away from the heart.

Capillaries
Tiny blood bessel where substances are exchanged between the blood and the body cells.

Veins
A blood vessel that carries blood back to the heart.

Pulse
The alternating expansion and relaxation of an artery wall as blood travels through an artery.

Blood Pressure
The pressure that is exerted by the blood against the walls of blood vessels.

Plasma
The liquid part of the blood.

Red Blood cells
A cell in the blood that takes up oxygen in the lungs and delivers it to cells elsewhere in the body.

Hemoglobin
An iron containing protein that binds chemically to oxygen molecules: makes up most of red blood cells.

White Blood Cells
A blood cell that fights disease

Platelets
A cell fragment that plays an important part in forming blood clots.

Lymphatic system
A network of veinlike vessels that returns the fluid that leaks out of blood vessels to the bloodstream.

Lymph nodes
A small knob of tissue in the lymphatic system that filters lymph, trapping bacteria and other microorganisms that cause disease.

Atherosclerosis
A condition in which an artery wall thickens as a result of the buildup of fatty materials.

Heart attack
A condition in which blood flow to part of the heart muscle is blocked, causing heart cells to die.

Hypertension
A disorder in which a person’s blood pressure is consistently higher than normal; also called high blood pressure.

What are the four components of blood?
Plasma, red blood cells, white blood cells and platelets

What happens to stop bleeding when you cut yourself?
Blood clots form, platelets collect and stick to the vessel at the site of the wound.

List three things to keep your cardiovascular system stay healthy.
Exercise regularly, eat balanced diet, avoid smoking

what does the circulatory system consist of?
Heart, blood vessels, and blood

What three functions does the cardiovascular system perform?
Delivers needed materials, removes waste products, fights disease

Know pattern of blood flow..two loops. Where does the blood go in each?
Like a figure 8, heart is in the middle, first loop blood travels from the heart to the lungs then back to heart. Second loop, blood is pumped from the heart throughout the body and returns to the heart.

What causes blood pressure?
The force which the ventricles contract.

In which direction do your arteries carry blood?
Away from the heart

What is the function of capillaries in the body?
Substances are exchanged between the blood and body cells.

What function does the heart perform?
Pumps blood throughout the body.

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