Question

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

		The medulla oblongata controls blood pressure, breathing, and other involuntary processes.
		Astrocytes participate in forming the blood brain barrier by extending cellular processes that wrap around cerebral arterioles.
		Oligodendrocytes form myelin in the peripheral nervous system.
		Both a) and b) are correct and c) is incorrect
		a), b) and c) are all correct

Human cerebral spinal fluid (CSF) (select the MOST CORRECT statement):

		CSF is similar in composition to blood plasma, except that it has a higher concentration of serum albumin.
		Glucose is a hydrophilic organic compound that can be found in blood plasma, interstitial fluid, and CSF.
		CSF bathes the brain and spinal cord and circulates through a system of ventricles and canals due to the contractile activity of ependymal cells.
		Both a) and b) are correct and c) is incorrect.
		a), b) and c) are all correct.

Answer 1

Medulla – The primary role of the medulla is regulating our involuntary life sustaining functions such as breathing, swallowing and heart rate. As part of the brain stem, it also helps transfer neural messages to and from the brain and spinal cord. It is located at the junction of the spinal cord and brain.

Astrocytes are essential for the formation and maintenance of the BBB by providing secreted factors that lead to the adequate association between the cells of the BBB and the formation of strong tight junctions.

Schwann cells

Myelin is formed by Schwann cells in the peripheral nervous system (PNS) and oligodendrocytes in the central nervous system (CNS). Each Schwann cell forms a single myelin sheath around an axon.

Both a) and b) are correct and c) is incorrect / so this option is the correct answer