Question

nervous tissue: structure and function
even though it is complex, nervous tissue is made up of just two principal types of cells—supporting cells and neurons
supporting cells
supporting cells in the cns are \lumped together\ as neuroglia (nu - rogle - ah), literally,
erve glue,\ also called glial cells or glia. neuroglia include many types of cells that support, insulate, and protect the delicate neurons (figure 7.3). in addition, each of the different types of ( 1 ) has special functions. cns neuroglia include the following

• astrocytes: abundant star - shaped cells that account for nearly half of neural tissue (figure 7.3a) their numerous projections have swollen ends that cling to neurons, bracing them and anchoring them to their nutrient supply lines, the ( 2 ) capillaries. astrocytes form a living barrier between capillaries and neurons, help determine capillary permeability, and play a role in making ( 3 ) between the two. in this way, they help protect the neurons from harmful substances that might be in the blood. astrocytes also help control the chemical ( 4 ) in the brain by \mopping up\ leaked potassium ions, which are involved in generating a nerve impulse, and recapturing chemicals released for communication purposes.
• microglia (mi - krogle - ah) spiderlike phagocytes that monitor the health of nearby ( 5 ) and dispose of debris, such as dead brain cells and bacteria (figure 7.3b)

1. blood 2. exchanges 3. environment 4. neurons 5. neuroglia

1 neurons 2 neuroglia 3 blood 4 exchanges 5 environment
1 environment 2 neurons 3 neuroglia 4 blood 5 exchanges
1 neuroglia 2 blood 3 exchanges 4 environment 5 neurons
1 exchanges 2 environment 3 neurons 4 neuroglia 5 blood

Explanation:

Supporting cells in the CNS are neuroglia which have special functions. Astrocytes interact with neurons and blood - capillaries, making exchanges and protecting neurons. Microglia monitor the health of nearby neurons.

Answer:

1. neuroglia 2. blood 3. exchanges 4. environment 5. neurons