Biology Quiz 8

What molecule is essential for muscle movement and cellular work?

• Carbon dioxide

• Oxygen

• Adenosine triphosphate (ATP)

• Glucose

How many skeletal muscles are in the human body?

• Over 500

• Exactly 640

• More than 700

• About 200

What are the two main proteins involved in muscle contraction?

• Keratin and melanin

• Hemoglobin and myoglobin

• Insulin and glucagon

• Actin and myosin

What ion triggers the muscle contraction process?

• Magnesium

• Potassium

• Calcium

• Sodium

What causes muscles to relax after contraction?

• Depletion of ATP

• Release of potassium ions

• Absence of calcium ions

• Binding of ATP to myosin heads