9, Possesses a single process from the cell body PART B: Assessments Match the t

ID: 3480582 • Letter: 9

Question

9, Possesses a single process from the cell body PART B: Assessments Match the terms in column A with the descriptions in column B. Place the letter of your choice in the space provided. Column A ColumnB a. Effector b. Ependymal cell c. Ganglion d. Interneuron (association neuron) e. Microglia f. Motor (efferent) neuron g. Oligodendrocyte 1. Transmits impulse from sensory to motor neuron within central nervous system 2. Transmits impulse out of the brain or spinal cord to effectors (muscles and glands) 3. Transmits impulse into brain or spinal cord from receptors 4. Myelin-forming neuroglia in brain and spinal cord h. Sensory (afferent) neuron -5. Phagocytic neuroglia 6. Structure capable of responding to motor impulse -7. Specialized mass of neuron cell bodies outside the brain or spinal cord 8. Cells that line cavities of the brain and secrete cerebrospinal fluid

Explanation / Answer

a: Effector: Effector respond to signals from the brain and CNS. It is the organs, muscles and glands in the body. The effector organs responds to these signals sent by motor neurons and initiates the response.

Option 6.

b. Ependymal cells are neuroglia that form the epithelial lining of the ventricles of the brain and central canal of spinal cord. They are derived from neuroectoderm. Ependymal cells in ventricles have cilia on their surface, which beat to influence the flow of cerebrospinal fluid (CSF). Ependymal cells are also line the blood vessels of choroid plexus, where they produce CSF by selective uptake of water and nutrients from blood into the cell.

Option 8.

c. Ganglion is a cluster of interconnected nerve cells present in peripheral nervous system. Ganglia have somata and interconnected dendritic structures. They are located outside the brain and spinal cord. They control the functioning of the internal organs of the body in vertebrates.

Option 7.

d. Interneuron’s, also known as sensory neurons interconnect the sensory and motor neurons. Hence, they transmit information from sensory to motor neurons in the CNS. They are found in brain and spinal cord. Interneuron’s release glutamate as a neurotransmitter to activate tissue in reflex response. In case of inhibition, they sometimes use gamma-aminobutyric acid (GABA).

Option 1.

e. Microglia are a type of neuroglia present in brain and spinal cord. They are phagocytic cells acting as a first line of defense against pathogens in CNS. They clear cellular debris and dead neurons by the process of phagocytosis.

Option 5.

f. Motor neurons are neurons whose cell body is present in the spinal cord but the axon projects outside the spinal cord. They control the effector organs, muscle and glands either directly or indirectly. They transmit messages from spinal cord to the peripheral effector organs.

Option 2.

g. Oligodendrocytes are involved in synthesis of myelin, an insulator of axonal segments. Oligodendrocytes are found in white and gray matter in brain and spinal cord. They are interconnected with gap junctions containing connexins.

Option 4.

h. Sensory afferent neurons carry nerve impulses from sensory stimuli to the CNS and primary sensory center in the brain. These neurons carry impulses from muscles organs (nose, skin) and glands and relay it to the brain.

Option 3.

Column A

Column B

Effector

Ependymal cells

Ganglion

Interneuron (Association Neuron)

Microglia

Motor (efferent) neuron

Oligodendrocyte

Sensory afferent neurons