Muscle control

Question 1

What is skeletal muscle control under

Answer 1

Voluntary control - somatic nervous system

Question 2

What does efferent mean?

Answer 2

Motor neurons transmit signals from the brain and spinal cord to the muscles.

Question 3

What happens a motor neuron interacts with muscle fibre?

Answer 3

Acetylcholine (ACh) is released from the motor neuron, binding to receptors on the muscle cell membrane (sarcolemma).

Question 4

Reflex arcs are

Answer 4

Involuntary muscle responses to stimuli.
Involve sensory input, processing in the spinal cord, and motor output without direct involvement of the brain.

Question 5

How does muscle contraction work

Answer 5

Muscle contraction occurs as actin (thin filaments) slide past myosin (thick filaments), shortening the sarcomere.

Question 6

Explain the cross bridge cycle

Answer 6

• Attachment: Myosin heads bind to actin forming cross-bridges.
• Power Stroke: Myosin heads pivot, pulling actin filaments towards the center of the sarcomere.
• Detachment: ATP binds to myosin heads causing them to release actin.
• Reactivation: ATP is hydrolyzed, re-energizing the myosin heads