Homeostsis - Part 2

Question 1

What is adrenaline - epinephrine

Answer 1

Produced by your adrenal glands
Low concentration of glucose , stressed and exercising
It increases glucose concentration, heart rate and breathing rate

Question 2

Why the percentage increase in adrenaline after point B in different from the percentage increase after point A

Answer 2

Increase of heart rate
Levels haven’t returned to normal yet
Increase oxygen to brain muscles

Question 3

Negative feedback

Answer 3

Normal level - levels change from normal - receptors detect the change - effectors respond - communication via nervous or hormonal system

Question 4

Temperature control - thermoregulation

Answer 4

Too hot
Vasodilation - the widening of the arterioles near the surface of the skin
Skin chnages colour
Hair stands up

Too cold
Vasoconstriction- the narrowing arterioles near the surface of the skin
Sweat glands
Hair erector muscles - creates barriers to insulate body

Question 7

Describe how the body responds when decrease in fire body temperature is detected

Answer 7

Vasoconstriction
Less blood flow to the skin
Less energy is loss shivering by muscles - contraction
Releases energy or respiring

Question 8

What is Diabetes type 1

Answer 8

Blood glucose concentration can’t be controlled
Pancreas doesn’t work properly
No insulin produced
Treated with insulin
Controlled diet

Question 9

Control of blood sugar

Answer 9

Too high
Causes stimulation of glucose and causes glucose to be turned into glycogen
Remove glucose from the blood

Too low
Glucagon causes it to go from glycogen to glucose

Question 10

Diabetes type 2

Answer 10

Later in life
Obesity
Body cells no longer respond
Diet / excersie

Body cells stop responding to insulin
Blood glucose levels will be really high

Question 11

Give two ways in which people with type diabetes 1 control their blood glucose concentration

Answer 11

Insulin if it’s too high
Glucagon if it’s too low
Controlled diet

Question 12

Explain how the formation of glycogen if the liver cells leads to lowering of blood glucose concentration

Answer 12

Glucose conc in the cell falls below that on blood which maintains glucose conc
Glucose enters cells and leaves blood by facilitated diffusion

Question 13

Homeostasis is vital for maintaining a stable internal environment in organism -30 marks

Describe the principles and importance of homeostasis - 10 marks

Answer 13

Maintains of a stable internal environment ,also maintains body temp , glucose , PH and water levels in the body
Helps body regulate good conditions in the body - if their is an increase in a condition above optimum level then the body will detect it and and the effectors will cause a change in the body which may result in a high or low.
To much water in the blood - less ADH released - and dilute urine excreted
To less water then more ADH is released and more water is absorbed back in the blood and less in the urine

More concentrated for a more lower amount of of volume .
Example- there are many glands in our body that help regulate our homeostasis , they impact from. Water control to temperature control
And control the levels in our body so example thyroid gland are responsible for control of metabolism.
We also have osmoregulation in our body to help control the water in the blood and to make sure it is kept constant
So if it is too low you are dehydrated so the body will regulate to make sure the water is brought back to constant
If the water potential in the blood is too high you will be hydrated and the body will regulate it to bring it back to constant .
We can talk about kidneys , and ADH and also the osmoregulation