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Unit 2

About 98% of the human body is composed of only six elements: oxygen, carbon, hydrogen, nitrogen, calcium, and phosphorous.


The respiratory system is responsible for:

Supplying oxygen to the body
B. Eliminating carbon dioxide in the body
C. Regulating the body's pH balance

The circulatory system consists of:

Heart, arteries, and veins

The nervous system is made up of the

Peripheral nervous system and Central nervous system

Excretion is one function of the digestive system.


Hormones are classified as:

Steroids, Amino acid derivatives and Peptides

Hemoglobin is an oxygen transporting protein in red blood cells.


The main purpose of hormones is to:

Alter the rate of synthesis of your cellular protein
B. Change the rate of enzyme activity
C. Change the rate of transport of nutrients through the cell wall.

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