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 b) diaphysis; epiphysis c) endosteum; periosteum d) epiphysis; diaphysis 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:

For question 23, the periosteum is the outer connective - tissue sheath of a long bone, and the endosteum lines the medullary cavity.
For question 26, astrocytes anchor neurons to blood capillaries.
For question 28, based on the structure (single process from the cell body), it is a unipolar neuron.

Answer:

1. A. periosteum; endosteum
2. A. anchor neurons to blood capillaries
3. C. unipolar neuron