Gray matter of spinal cord contains:
Correct answer: C. Cell bodies and unmyelinated cell processes
- A. Ganglia
- B. Myelinated cell processes only
- C. Cell bodies and unmyelinated cell processes
- D. Cell bodies and myelinated cell processes
Explanation
Option C is correct.The gray matter of the spinal cord contains cell bodies and unmyelinated cell processes, but not all of them. The spinal cord contains two types of gray matter: the central gray matter and the dorsal gray matter. The central gray matter is located in the center of the spinal cord, and it contains the cell bodies of neurons that control involuntary movements, such as breathing and heart rate. The central gray matter also contains axons that connect the cell bodies to other parts of the CNS. The dorsal gray matter is located in the back of the spinal cord, and it contains the cell bodies of neurons that receive sensory information from the body. The dorsal gray matter also contains axons that connect the cell bodies to other parts of the CNS, such as the brain. Both the central gray matter and the dorsal gray matter contain unmyelinated cell processes, which are the long, slender extensions of neurons that carry signals to other neurons. However, the central gray matter also contains myelinated cell processes, which are the long, slender extensions of neurons that are covered with a fatty sheath that helps to insulate them.
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Coordination depends on receptors, neurons, synapses and nerve impulses, with reflex actions traced through the reflex arc and the roles of major brain regions. Chemical coordination covers endocrine glands and hormones, including how hormones regulate growth, metabolism, reproduction and internal balance, unlike rapid nervous control.
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