MNN3701 Assignment 1 (COMPLETE ANSWERS) Semester 1 2026
(360803) - DUE 11 March 2026
The brain and the spinal cord make up the _____ nervous system. - >>>>>>>ANSWER
Central
An action potential arriving at the presynaptic axon terminal causes: -
>>>>>>>ANSWER Voltage-gated calcium ion channels to open, and calcium ions to
diffuse into the synaptic knob
After an action potential arrives at a synaptic knob, opening calcium channels and
allowing calcium to enter the cell, what happens next? - >>>>>>>ANSWER Synaptic
vesicles migrate to the plasma membrane and release acetylcholine
Describe the effect of acetylcholine on the postsynaptic neuron. - >>>>>>>ANSWER
Ligand (chemically)-gated sodium channels open and sodium diffuses into the
postsynaptic neuron
Match the description with each functional aspect of the nervous system.
1. Detects stimulus/informs CNS
2. Decides response
3. Response - >>>>>>>ANSWER 1. Sensory function
2. Integrative functions
3. Motor Function
Detection of changes inside and outside of the body is the function of: -
>>>>>>>ANSWER Sensory receptors
The muscles and glands whose activities are controlled by nervous activity are called: -
>>>>>>>ANSWER Effectors
1. The effectors of the _____ nervous system are skeletal muscles.
2. The effectors of the ____ nervous system include cardiac muscle, smooth muscle,
and glands. - >>>>>>>ANSWER 1. Somatic
2. Autonomic
1. Dendrite
2. Axon - >>>>>>>ANSWER 1. Branched processes, receives incoming signals, thorn-
like spines maybe present
2. Single process, ends with synaptic knobs, sends outgoing impulses, may have
collaterals, Associated with Schwann cells, supported by neurofibrils
Match the descriptions with the correct part of a neuron.
1. Branches of axon
2. Release neurotransmitter
3. Provide support for axon hillock and axon
4. Rough endoplasmic reticulum - >>>>>>>ANSWER 1. Collaterals
2. Synaptic knobs
3. Neurofibrils
4. Chromaphilic substance
The myelin sheath along an axon is not continuous. Between Schwann cells are gaps
called: - >>>>>>>ANSWER Nodes of Ranvier
Diagram - >>>>>>>ANSWER Diagram
1. In the central nervous system, myelin is formed by cells called _____
(360803) - DUE 11 March 2026
The brain and the spinal cord make up the _____ nervous system. - >>>>>>>ANSWER
Central
An action potential arriving at the presynaptic axon terminal causes: -
>>>>>>>ANSWER Voltage-gated calcium ion channels to open, and calcium ions to
diffuse into the synaptic knob
After an action potential arrives at a synaptic knob, opening calcium channels and
allowing calcium to enter the cell, what happens next? - >>>>>>>ANSWER Synaptic
vesicles migrate to the plasma membrane and release acetylcholine
Describe the effect of acetylcholine on the postsynaptic neuron. - >>>>>>>ANSWER
Ligand (chemically)-gated sodium channels open and sodium diffuses into the
postsynaptic neuron
Match the description with each functional aspect of the nervous system.
1. Detects stimulus/informs CNS
2. Decides response
3. Response - >>>>>>>ANSWER 1. Sensory function
2. Integrative functions
3. Motor Function
Detection of changes inside and outside of the body is the function of: -
>>>>>>>ANSWER Sensory receptors
The muscles and glands whose activities are controlled by nervous activity are called: -
>>>>>>>ANSWER Effectors
1. The effectors of the _____ nervous system are skeletal muscles.
2. The effectors of the ____ nervous system include cardiac muscle, smooth muscle,
and glands. - >>>>>>>ANSWER 1. Somatic
2. Autonomic
1. Dendrite
2. Axon - >>>>>>>ANSWER 1. Branched processes, receives incoming signals, thorn-
like spines maybe present
2. Single process, ends with synaptic knobs, sends outgoing impulses, may have
collaterals, Associated with Schwann cells, supported by neurofibrils
Match the descriptions with the correct part of a neuron.
1. Branches of axon
2. Release neurotransmitter
3. Provide support for axon hillock and axon
4. Rough endoplasmic reticulum - >>>>>>>ANSWER 1. Collaterals
2. Synaptic knobs
3. Neurofibrils
4. Chromaphilic substance
The myelin sheath along an axon is not continuous. Between Schwann cells are gaps
called: - >>>>>>>ANSWER Nodes of Ranvier
Diagram - >>>>>>>ANSWER Diagram
1. In the central nervous system, myelin is formed by cells called _____
