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28:Parkinson’s disease and multiple sclerosis are two disorders that directly affect glial cells. When glial cells...


28:Parkinson’s disease and multiple sclerosis are two disorders that directly affect glial cells. When glial cells are damaged, which of the following functions is most likely to be affected?
A:Basic cell processes, such as cellular respiration.
B:Receiving of neurotransmitters released by adjacent neurons.
C:Transmission of electrical signals along the axon.
D:Release of neurotransmitters by terminal buds.

29:If an event occurs periodically, but has a significant impact on the internal environment which method of homeostatic control is most likely?
A:It is impossible to determine.
B:Positive feedback.
C:Negative feedback.
D:Periodic events are not subject to homeostatic control.
30:A collection of neurons are an example of:
A:Tissues.
B:Organ systems.
C:Organs.
D:Cells.

Solutions

Expert Solution

28) A:Basic cell processes, such as cellular respiration.

Explanation: Astrocytes of the glial cells are responsible for providing nutrients to the neurons. When glial cells are affected, this function would be hampered leading to disruption in cellular respiration.

Nervous tissue are composed of main conducting neurons and supporting Neuroglial cells.

Neuroglial cells are the supporting tissue present around the neurons. They provide support and nutrition. Some Neuroglial cells form myelin sheaths.
Neuroglial cells are of two types
1) Macroglial cells
These are further of three types
- oligodendrocytes which form myelin sheath
- epindymal CELLS which secrete CSF
- Astrocytes which support and provide nutrition to the neurons
- They also take part in Reuptake of neurotransmitter by reabsorption

2) Microglial cells
- These are phagocytic cells of the CNS

29. C:Negative feedback.

Explanation: periodic events are regulated by negative feedback.

periodic rise of an activity is is inhibited by the negative feedback process.

30. Tissues

Explanation: Neurons are the cells of the nervous system. Collection of neurons with neuroglial cells will be tissue. Collection of neurons with neuroglial cell forming brain or spinal cord will be organ

gladiator answered 2 years ago
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