7.3 Smooth and Cardiac Muscle, naming muscles, and levers

Which process describes the alternating relaxation and contraction of smooth muscle?

• Peristalsis

• Tetany

• Summation

• Fibrillation

Smooth muscle is innervated by which part of the nervous system?

• Somatic nervous system

• Central nervous system

• Autonomic nervous system

• Peripheral nervous system

What molecule is required for smooth muscle contraction, but is used in smaller amounts compared to other muscle types?

• Glucose

• ATP

• Oxygen

• NADH

What is the role of Myosin Light Chain Kinase (MLCK) in smooth muscle contraction?

• It uncovers actin by binding to troponin

• It activates myosin so it can pull on actin

• It breaks down ATP into ADP and phosphate

• It transports calcium ions into the cell

Which of the following is true about cardiac muscle?

• It is found throughout the body.

• It is only found in the heart.

• It is only found in the lungs.

• It is only found in the digestive system.

What is the primary function of intercalated discs in cardiac muscle tissue?

• To store calcium ions

• To connect cardiac muscle cells and facilitate synchronized contraction

• To produce energy for muscle contraction

• To insulate nerve fibers

Which type of muscle tissue is characterized by the presence of intercalated discs?

• Skeletal muscle

• Smooth muscle

• Cardiac muscle

• Connective tissue

Which nervous system innervates cardiac muscle, making its contraction involuntary?

• Somatic nervous system

• Central nervous system

• Autonomic nervous system

• Peripheral nervous system

Which neurotransmitter slows the heart rate in cardiac muscle?

• Dopamine

• Norepinephrine

• Acetylcholine (ACh)

• Serotonin

Identify the correct statement from below:

• Cardiac muscle does not regenerate well and is replaced by scar tissue, which cannot contract, leading to reduced ability of the heart to move blood.

• Cardiac muscle regenerates quickly, improving heart function.

• Cardiac muscle is replaced by fat, which helps the heart contract.

• Cardiac muscle is replaced by bone, making the heart stronger.