This set of Human Physiology test focuses on “Conduction of Nerve Impulses, Structure and Types of Neurons”.
1. A neuron is formed of 3 parts.
Explanation: A neuron is formed of 2 parts. Neuron is made up of cyton and nerve processes.
2. Nissl’s granules are present in ____________
c) Nerve cells
Explanation: Nissl’s granules are of rough endoplasmic reticulum with rosettes of a free ribosome and are site of protein synthesis. Nissl’s granules are present in nerve cells.
3. Nodes of Ranvier are found in ________
a) Myelinated nerve fibers
b) Non myelinated nerve fibers
Explanation: Nodes of Ranvier are found in myelinated nerve fibers. It is a gap in the myelin sheath of a nerve between adjacent Schwann cells.
4. Myelin sheath is derived from ___________
a) Nerve cells
b) Schwann cells
c) Neuroglial cells
Explanation: Schwann cell is also called a neurilemma cell. It is the cells in peripheral nervous system that produce the myelin sheath around neuronal axons. It was discovered in the 19th century.
5. Which of the following are the parts of neurons?
a) Sympathetic and parasympathetic
b) Dendrite axon and cell body
c) Cortex medulla and sheath
d) Brain spinal cord and vertebral column
Explanation: Neurons are made up of dendrite axon and cell body. It helps in conducting the nerve impulse to different body parts.
6. Which of the following is true regarding interneuron?
a) It has long dendrites and a long axon
b) It has long dendrites and a short axon
c) It has short dendrites and a long or short axon
d) It has short dendrites and a long axon
Explanation: Interneuron is relays signals between a sensory neuron and motor neurons. Interneuron has short dendrites and a long or short axon.
7. Which of the following is the disease of myelin sheath?
d) Multiple sclerosis
Explanation: Multiple sclerosis is a disease in which the immune system eats away at the protective coverings of the nerves, It is also called as MS. MS is the disease of myelin sheath.
8. Axoplasm is a ______
a) Cytoplasm of axon
b) Cytoplasm of dendrite
c) Blood plasma
d) External fluid to axon but inside myelin sheath
Explanation: Axoplasm is a cytoplasm of the axon. Axoplasm has a different composition of organelles and other materials than that found in the neurons cell body r dendrites.
9. Which of the following neurotransmitter is not a biogenic amine?
Explanation: Neuropeptides is not a biogenic amine. It is a protein like molecules used by neurons to communicate with each other. They are neuronal signaling molecules.
10. Polysynaptic membranes are found in __________
c) Myelin sheath
d) Neuron cell bodies
Explanation: Polysynaptic membranes are found in dendrites. It shows slow depolarization.
11. During salutatory conduction, a nerve impulse jumps from one ___________ to another.
c) Myelin sheath
d) Node of Ranvier
Explanation: Salutatory conduction is a transmission of nerve impulses along myelinated fibers. During salutatory conduction a nerve impulse jumps from one Node of Ranvier to another.
12. Neurons that carry impulses away from the central nervous system are _________
a) Sensory nerves
c) Afferent nerves
d) Efferent nerves
Explanation: Efferent nerves are the neurons that send an impulse from CNS to limbs and organs. Neurons that receives information from sensory organs and transmits input to CNS is called afferent neurons.
13. A nerve impulse is first received by ___________
Explanation: Dendrites are branched protoplasmic extensions of a nerve cell that propagate electrochemical stimulation received from neural cells to the cell body. It is a tree like structure. A nerve impulse is first received bydendrites.
Sanfoundry Global Education & Learning Series – Human Anatomy and Physiology.
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