Question 1:

Which protein is responsible for the striated appearance of skeletal muscle?

Explanation: The protein responsible for the striated appearance of skeletal muscle is actin. Actin and myosin filaments are organized in a highly ordered manner, giving rise to the striated pattern observed under a microscope.

Question 2:

What is the functional unit of skeletal muscle called?

Explanation: The functional unit of skeletal muscle is called a sarcomere. Sarcomeres are repeating units along the length of the myofibrils and are responsible for muscle contraction.

Question 3:

Which molecule stores and releases calcium ions during muscle contraction?

Explanation: The sarcoplasmic reticulum is responsible for storing and releasing calcium ions during muscle contraction. Calcium ions play a crucial role in initiating muscle contraction by binding to troponin and allowing actin and myosin to interact.

Question 4:

What is the role of motor neurons in skeletal muscle contraction?

Explanation: Motor neurons play a crucial role in skeletal muscle contraction by transmitting electrical signals from the central nervous system to stimulate muscle fibers. The electrical signals trigger the release of calcium ions and initiate the sliding filament mechanism of muscle contraction.

Question 5:

What is the connective tissue layer that surrounds individual muscle fibers?

Explanation: The connective tissue layer that surrounds individual muscle fibers is called endomysium. It provides support and protection to the muscle fibers, as well as helps to maintain their structural integrity.