Question

In: Anatomy and Physiology

1. Which response serves to decrease body temperature if body temperature increases above its normal range?...

1. Which response serves to decrease body temperature if body temperature increases above its normal range?

Question 2 options:

constriction of blood vessels in the dermis

increased contraction of skeletal muscles

increased secretion of sweat from sweat glands

2.Where in the epidermis is new cell division most likely to occur?

stratum basale

stratum corneum

stratum granulosum

stratum lucidum

3. How long is a keratinocyte typically part of the epidermis before it is sloughed off of the apical surface?

Question 8 options:

2-3 days

10-20 days

40-50 days

about six months

4.

Which of the following correctly describes the root and the shaft of a hair?

the shaft is the portion of the hair that is above the surface of the skin whereas the root is the portion of the hair that is below the surface of the skin

the shaft is the portion of the hair that is surrounded by the hair follicle whereas the root is the portion of the hair that is not surrounded by the hair follicle

the shaft contains actively dividing hair cells whereas the root contains only dead cells

the shaft is attached to the arrector pili muscle whereas the root is attached to sweat glands

5.

Which portion of the hair contains cells that actively undergo mitosis?

shaft

follicle

matrix

cuticle

Solutions

Expert Solution

1)

A wrong If vasoconstriction occurs, there is less blood flow to the skin. In this way, the body tries to conserve the heat. Therefore it will increase the temperature.
B wrong increased skeletal muscle contraction will produce heat which will elevate the body temperature.
C right sweating decreases the body temperature.

2) The cell division in the epidermis of the skin occurs in the stratum basale (lowermost layer) only. From stratum basale, the keratinocytes come upward and approximately 40-60 days are taken for it to be completely sloughed off.

3) It takes about 40-60 days. Time required to move from stratum basale upto lowermost part of stratum corneum is 11-14 days.

To cross stratum corneum- 11-14 days.

The sloughing requires- 24-30 days.  

4)

A right root is below the surface of the skin but shaft is above the surface of skin.
B wrong Shaft is not anchored by follicle but shaft is anchored by follicle.
C wrong shaft contains dead cells whereas the root contains actively dividing cells.
D wrong Shaft is attached to the glands whereas the root is attached to the arrector pili muscle.

5) The part of hair which continuously undergoes mitosis is hair follicle.

Sydney Mullin answered 1 year ago
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