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Horse Circulatory System
To help study for the 2013 4-H hippology test at Big-E
9
Agriculture
12th Grade
05/30/2013

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Cards

Term
What does the horse circulatory system include?
Definition
It includes the capillaries,veins,venules,arteries, arterioles, and heart.
Term
Define Heart
Definition
The organ that pumps the blood throughout the large body.
Term
At rest what is a horse's average heart rate? What  factors would change this?
Definition
At rest the average horse's heart rate is 35 beats per minute, however this can be increased or decreased through factors such as exercise and age.The heart rate may also be an indicator that a horse has a medical condition.
Term
Where are the 3 primary places that blood is drawn from a horse?
Definition

1.) The jugular vein in the neck (the most common)

2.) In the leg

3.) By scraping the buccal, or cheek region inside the horse's mouth.

Term
Describe arteries and their function.
Definition
Arteries are muscular tubes that carry oxygenated blood away from the heart (*Remembering hint: A in arteries is for Away from the heart) and to all parts of the body. Arteries decrease in size as they move away from the heart and begin to branch into arterioles and then very small tubes known as capillaries.
Term
Describe capillaries and their function.
Definition
Capillaries are very small tubes where the exchange of oxygen occurs. Once the oxygen has been given to the different parts of the body the capillaries give way to venules and then veins.
Term
Describe veins and their function.
Definition
Veins carry the de-oxygenated blood back to the lungs to get oxygenated again. Muscle pressure in the legs helps the veins carry the blood back up the body.
Term
When does the horse's body need the most oxygen?
Definition
During exercise
Term
Describe the basic order that blood moves through the parts of the circulatory system in a horse.
Definition
First oxygenated blood is pumped from the heart to the arteries. The arteries narrow and branch into arterioles and then capillaries. At the capillaries oxygen is given to parts of the body. After this exchange is done blood travels from the capillaries to the venules and then to the veins where is is brought back up to the lungs with help from the muscle pressure in the legs to be re-oxygenated and then back to the heart to be pumped out again and re-start the cycle.
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