Question

Efferent division of the nervous system (human) (select the MOST CORRECT statement):

		Autonomic preganglionic neurons always communicate with postganglionic neurons through the release of acetylcholine.
		Motor neurons that innervate skeletal muscle are always excitatory.
		Sweat glands are innervated by sympathetic neurons only, and are not regulated by parasympathetic neurons.
		Both a) and b) are correct and c) is incorrect.
		a), b) and c) are all correct.

Regarding mammalian nervous systems (select the MOST CORRECT statement):

		The cerebellum is involved with the coordination of body movements.
		Microglia function as immune cells in the central nervous system.
		Grey matter in the spinal cord is associated with myelinated axons.
		Both a) and b) are correct and c) is incorrect.
		a), b) and c) are all correct.

Answer 1

1) answer- a) ,b),c) are all correct.

Explanation- In the autonomic nervous system, usually acetylcholine is the neurotransmitter in the preganglionic sympathetic and parasympathetic neurons.

Alpha motor neurons innervates skeletal muscle and cause the muscle contractions that generate movement.

The sweat glands are innervated by the sympathetic nervous system and their innervation consists of two parts, a preganglionic and postganglionic neuron.

2) answer-a) ,b) are correct and c) is incorrect.

Explanation- The cerebellum is the part of the hindbrain which receives information from the sensory systems, the spinal cord and other parts of the brain and then regulates motor movements and they also coordinates voluntary movements such as posture, balance, speech, coordination resulting in smooth, balanced muscular activity.

Microglia cells are the immune cells of the central nervous system which play important roles in brain infections and inflammation.

The grey matter contain some myelinated axons but only a few compared to the white matter.

Hope this helps you. Thank you ?