Describe the arrangement within a myofibril.
What will be an ideal response?
Thick and thin filaments within a myofibril are arranged in repeating functional units (sarcomeres), which give the
banded appearance. All of the myofibrils are arranged parallel to the long axis of the cell, with the sarcomeres side
by side. As a result, the entire muscle has a banded appearance, corresponding to the bands of the individual
sarcomeres on each side of the H band, comprise the A band.
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Why is the optic disc sometimes called the blind spot of the eye?
A. There are no blood vessels there. B. There are no nerve fibers there. C. There are rods there, but no cones, so color vision is not possible in that area. D. There are no rods and cones there. E. There are cones there, but no rods, so black and white vision is not possible in that area.
What does thyrotropin-releasing hormone target?
A.)hypothalamus B.)posterior pituitary (neurohypophysis) C.)anterior pituitary (adenohypophysis) D.)thyroid gland
Which tissue consists of short, branched cells with intercalated discs?
A. Dense regular connective tissue B. Skeletal muscle C. Visceral muscle D. Smooth muscle E. Cardiac muscle
A splinter penetrated into the skin of the sole of the foot, almost to the papillary region of the dermis. Which layer of the epidermis would be the final layer injured?
A) basale B) spinosum C) lucidum D) granulosum