homeostasis

Question 1

define homeostasis

Answer 1

maintenance of a constant internal environment

Question 2

what organs are involved in homeostasis?

Answer 2

• skin
• kidneys
• pancreas
• brain

Question 3

define stimulus

Answer 3

any change occurring inside or outside the body detected by the brain

Question 4

give an example of positive feedback

Answer 4

• blood clotting
• child birth
• fruitripening

Question 5

give an example of negative feedback

Answer 5

• regulation of body temp
• fluid content
• blood pressure

Question 6

what is the receptor for glucose level?

Answer 6

islets of langerhans

Question 7

define vasodilation

Answer 7

a rise in body temp leads to a rise in the bloods as well causing the capillaries to dilate for an increase in supply to get rid of heat via sweat

Question 8

what is the receptor for temp change

Answer 8

hypothalamus

Question 9

what does the vasometer do when temp is cold?

Answer 9

sends order for vasocontraction

Question 10

describe the skin

Answer 10

• largest organ of the body
• imp sense organ
• barrier to external environment
• regulates body temp

Question 11

what is the epidermis?

Answer 11

outer layer of the skin
contains 3 layers

Question 12

what is the cornified layer?

Answer 12

• made up of dead cells
  -protects the body from water loss, mechanical thermal and chemical damages, invasion of microbes

Question 13

what is the granual layers made of?

Answer 13

living cells

Question 14

what is the malpighian layer?

Answer 14

• replaces dead cells from the cornified layer
• melanin as protection against uv rays

Question 15

what are the functions of the epidermis?

Answer 15

-waterproof
- prevention on evaporation
- stop germ andar ana
- stop against mechanical energy

Question 16

what is the dermis?

Answer 16

contains:
- blood vessels
- hair
- sweat glands
- temp receptors
- fatty tissue
- sebacious glands

Question 17

define vasodilation

Answer 17

dilation of arteries

Question 18

define vasocontraction

Answer 18

contraction of arterioles

Question 19

describe the hair feature of the skin

Answer 19

• grows from the hair follicle
• hair eractus muscle at the base of the follicle
• contracts causing hair to stand

Question 20

when does the hair erector muscle contract?

Answer 20

when the temp grows too low, causing a pocket of air to be made in the skin which insulates it

Question 21

what is the movement of sweat when formed?

Answer 21

from the sweat gland to the duct and finally coming out the pore

Question 22

how are temp receptors able to detect changes in enviroment?

Answer 22

• nerve ending in dermis and epidermis
• from sense organs
• hence able to detect changes

Question 23

what does the fatty tissue do?

Answer 23

• insulate the body
• provide cushioning
• stores energy

Question 24

what are the properties of the sebaceous gland?

Answer 24

• lubricates the hair
• secretes oil into the follicle
• has an antiseptic action