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Circulatory System Functions

By: Micheal, Maddy, Codey and Rumer

� 1) Transport of nutrients like glucose, amino acids, vitamins, minerals

� 2) Transport of oxygen from the organs of respiration to the body cells.

� 3) Transport of carbon dioxide from the body cells to the exterior.

Functions 1-3

� 4) Transportation of nitrogenous wastes from the body cells to the organs of excretion.

� 5) Transportation of hormones from the endocrine glands to their specific target organs

� 6) Transportation of water, hydrogen ions and chemical substances all over the body for their uniform distribution.

Functions 4-6

� 7) Transportation of heat from one region to another for homoeothermic.

� 8) Transportation of intermediate metabolites from one part of the body to another.

Functions 7-8

� There are 4 valves in the heart that help to direct blood flow.

� Blood flow from the arteries to it through the smallest tube like structures called capillaries.

� Inside the blood, oxygen is carried by the haemoglobin in the red blood cells.

Blood supply

� The heart weighs only 11 ounces

� The heart looks like an upside down pair

� The heart is one of the strongest muscles

� The center of the circulatory system

Characteristics

� Arteries

� Capillaries

� Veins

� Blood Pressure

Blood Vessels

� Arteries are the largest blood vessel in the body

� They carry blood filled with oxygen

� The walls are thick and elastic to be able to stand the pressure of the heart contractions

Arteries

� The capillaries are the smallest of the Blood Vessels

� They are so small that the blood cells must move through one at a time

� The thin walls allow oxygen to be removed from the blood and for toxins to enter

Capillaries

� The blood moves through the capillaries and into the veins to be cycled back to the heart

� Major veins in the arms and legs have to fight gravity to get back to the heart

� Located by or between the skeletal muscles

� When you move your skeletal muscles it applies pressure to the vein forcing blood to the heart

Veins

� The body can regulate blood pressure in many ways

� The kidneys regulate the amount of blood in the system

� This is regulated by the amount of hormones produced by the heart and other organs

� The kidney will remove or add water and get rid of it through urine

Blood Pressure

� When the heart beats it forces blood to move through the arteries

� When the heart relaxes it the arteries remain under pressure do to the elastic walls

� Doctors use a device called a sphygmomanometer to check your blood pressure

� This device is inflated around your arm to cut off the artery supplying blood

Blood Pressure