Understanding the Nervous System and Muscles

What are the two main components of the nervous system?

• Central Nervous System (CNS) and Autonomic Nervous System (ANS)

• Central Nervous System (CNS) and Peripheral Nervous System (PNS)

• Somatic Nervous System and Autonomic Nervous System

• Sympathetic Division and Parasympathetic Division

The part of the neuron responsible for receiving signals from other neurons is (a)   .

• Axon
• Dendrites
• Myelin Sheath
• Axon Terminals

What is the function of the myelin sheath in a neuron?

• To transmit electrical signals

• To release neurotransmitters

• To insulate the axon and increase signal transmission speed

• To contain the nucleus and organelles

A motor unit consists of (a)  

• A single motor neuron and all the m
• Multiple motor neurons and a single
• A single muscle fibre and its assoc
• Multiple muscle fibres and their as

According to the 'All or Nothing' law, when will a muscle fibre contract?

• Only if the stimulus is below its threshold

• Only if the stimulus reaches or exceeds its threshold

• Only if the stimulus is above its maximum threshold

• Only if the stimulus is at its minimum threshold

What is the first type of motor unit recruited according to the Size Principle of Motor Unit Recruitment?

• Larger motor units with faster fibres

• Smaller motor units with slower, fatigue-resistant fibres

• Larger motor units with fatigue-resistant fibres

• Smaller motor units with faster fibres

Match the following roles with their corresponding muscle functions in the stretch reflex.

• Autogenic inhibition

• To detect excessive tension in the muscle

• Muscle spindle function

• To inhibit motor neurons

• Golgi tendon organ function

• To relax the muscle

• Reciprocal inhibition

• To detect a stretch in the muscle

What triggers the inverse stretch reflex?

• Muscle spindles detecting a stretch

• Golgi tendon organs detecting excessive tension

• Sensory neurons transmitting a signal to the brain

• Motor neurons contracting the muscle

What is the function of Golgi tendon organs?

• To monitor changes in muscle length

• To detect tension in the muscle-tendon complex

• To activate the stretch reflex

• To contract the muscle

What is autogenic inhibition?

• A process where a muscle contracts when it experiences excessive tension

• A protective mechanism where a muscle relaxes when it experiences excessive tension

• A process where the contraction of one muscle group causes contraction in the opposing muscle group

• A mechanism that increases muscle force production