Question

33-1/Which of the following results in skeletal muscle hypertrophy in response to weightlifting?

Select one: _

a. Fusion of sarcomeres between adjacent myofibrils

b. Increase in the blood supply

c. Enlargement of individual muscle fibers

d. Increase in the number of neuromuscular junctions

2/In the retina, the cones differ from the rods in that the cones are:

Select one:

a. affected by vitamin A deficiency

b. sensitive to light

C. more abundant

d. concerned with color vision.

3/One of the following cells is NOT part of the innate immune system:

Select one: _

a. Macrophage _

b. Neutrophil

c. B cell

d. Natural killer (NK) cell e. Mast cell

4/The body thermoregulatory area is located in the: Select one: _

a. medulla

b. cerebellum

c. hypothalamus

d. cerebral cortex

Answer 1

1. The answer is option C

The muscular hypertrophy occurs due to the enlargement of the individual muscle fibres.The enlargement can be either sarcoplasmic or myofibrillar type.The sarcoplasmichypertrophy is due to the increase in the glycogen content and the myofibrillar is due to the increased size of each myofibril

2.The answer is option D

The cones are the photoreceptor cells that are concerned with the colour cision.They are fewer in number than the rodes.The rodes are the cells that are involved in the dimlight vision.

3.The answer is the option C

The macrophages,neutrophills,natural killer cells etc are involved in the innate immunity.The neutrophillsprotects the body by engulfing the pathogens.The macrophages releases chemical substances that signals the presence of pathogens.The Nk cells kills the infected host cells to prevent the spread of the infection

4.The answer is option C

The hypothalamus of the brain senses the difference in the body temperature and sends signals to various body parts so as to regulate the temperature.The mechanisms include shivering,movements etc