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.