Question

1. the produces an a) inward flow chloride; ipsp b) inward flow calcium; ipsp c) inward flow of calcium and sodium; ipsp d) inward flow of sodium; ipsp e) outward flow of potassium; epsp 23) a long bone is covered externally with a connective tissue sheath called the whereas the medullary cavity is lined with the a) periosteum: endosteum c) endosteum; periosteum e) compact bone; spongy bone 24) neurons carry impulses towards the cns, whereas neurons send signals to the effectors of the nervous system a) efferent; afferent b) efferent; association c) motor; sensory d) afferent; association e) afferent; efferent 25) the triads of a muscle fiber consist of a) two thin myofilaments and one thick myofilament b) two a bands and one i band c) two t tubules and one terminal cisterna d) two thick myofilaments and one thin myofilament e) two terminal cisternae and one t tubule 26) one role of astrocytes is to a) anchor neurons to blood capillaries b) serve as phagocytes for the cns c) produce the myelin sheath within the cns d) help produce cerebrospinal fluid 27) what is the name of the small gap that separates the axon terminal of a nerve from the sarcolemma? a) synaptic vesicle b) sarcoplasmic reticulum c) sliding filament d) t tubule e) synaptic cleft 28) the following is a picture of a(n) a) bipolar neuron b) smooth muscle cell c) unipolar neuron d) multipolar neuron

Explanation:

• Question 23:
• The periosteum is a connective - tissue sheath that covers the outer surface of long bones.
• The endosteum lines the medullary cavity.
• Question 26:
• Astrocytes have multiple functions. One of their roles is to anchor neurons to blood capillaries, which helps in the exchange of nutrients and waste products.
• Question 28:
• A unipolar neuron has a single process that extends from the cell body. The structure in the picture is consistent with the morphology of a unipolar neuron.

Answer:

• 23) A. periosteum: endosteum
• 26) A. anchor neurons to blood capillaries
• 28) C. unipolar neuron