Understanding Human Anatomy

What is the primary function of melanin in the skin?

• To produce vitamin D

• To store energy

• To absorb ultraviolet light from the sun

• To transport substances

Which muscle type is under voluntary control?

• Cardiac muscles

• Smooth muscles

• Skeletal muscles

• None of the above

Which type of muscle is found in the heart?

• Striated muscle

• Cardiac muscle

• Smooth muscle

• Skeletal muscle

Where are blood cells created in the human body?

• In the bone marrow

• In the liver

• In the kidneys

• In the heart

How many bones are in the adult human body?

• 206

• 270

• 300

• 320

What does the circulatory system transport?

• Both blood and lymph

• Oxygen only

• Blood only

• Lymph only

Which organ is primarily responsible for excreting carbon dioxide?

• Lungs

• Liver

• Kidneys

• Skin

Which system controls most of your daily activities?

• Digestive system

• Nervous system

• Muscular system

• Skeletal system