Muscle Physiology Quiz

What are the functions of the body's muscles?

• Digestion and absorption

• Movement, posture, and heat production

• Filtration and excretion

• Hormone production

Which of the following is NOT a type of muscle tissue?

• Cardiac

• Skeletal

• Smooth

• Connective

What happens when acetylcholine binds to its receptors?

• Muscle relaxation

• Muscle contraction

• Muscle fatigue

• Muscle atrophy

What ion is released from the sarcoplasmic reticulum during muscle contraction?

• Sodium

• Potassium

• Calcium

• Magnesium

What is a crossbridge in muscle contraction?

• A connection between actin and myosin

• A connection between two bones

• A connection between two nerves

• A connection between two tendons

What is the role of t-tubules in muscle contraction?

• Transport of oxygen

• Propagation of action potentials

• Storage of glycogen

• Removal of waste

What happens during muscle relaxation?

• Ca²⁺ is released into the cytoplasm.

• Ca²⁺ is pumped back into the sarcoplasmic reticulum.

• ATP is broken down rapidly.

• Myosin heads bind to actin.

What is a motor unit?

• A single muscle fiber

• A group of muscle fibers controlled by one motor neuron

• A type of muscle contraction

• A phase of muscle relaxation

Which energy source is NOT used in muscle contraction?

• ATP

• Creatine phosphate

• Glycogen

• Lipids

Which muscle fiber type is known for endurance?

• Fast Glycolytic

• Slow Oxidative

• Fast Oxidative

• Fast Twitch