Muscular System

Front

What is the role of acetylcholine in muscle contraction?

Back

Acetylcholine is a neurotransmitter that transmits signals from nerve cells to muscle cells, initiating muscle contraction.

Front

What is the sequence of events at a neuromuscular junction?

Back

1. Action potential reaches the presynaptic terminal. 2. Acetylcholine is released into the synaptic cleft. 3. Acetylcholine binds to receptors on the postsynaptic membrane. 4. Action potential is generated in the muscle cell. 5. Acetylcholine is broken down.

Front

What type of muscle is found in the walls of organs?

Back

Smooth muscle is found in the walls of organs.

Front

What are the two classifications of muscles in the human body?

Back

The two classifications of muscles are involuntary and voluntary.

Front

What is a neurotransmitter?

Back

A neurotransmitter is a chemical messenger released by neurons to transmit signals to other cells.

Front

What are muscles primarily composed of?

Back

Muscles are primarily composed of proteins.

Front

What is the difference between voluntary and involuntary muscles?

Back

Voluntary muscles are under conscious control (e.g., skeletal muscles), while involuntary muscles operate without conscious control (e.g., smooth and cardiac muscles).

Front

What is the function of skeletal muscle?

Back

Skeletal muscle is responsible for voluntary movements and is attached to bones.

Front

What is the function of cardiac muscle?

Back

Cardiac muscle is responsible for pumping blood throughout the body and is found only in the heart.

Front

What is the role of myofibrils in muscle cells?

Back

Myofibrils are the contractile units of muscle cells, composed of sarcomeres that facilitate muscle contraction.