Homeostatsis

Question 1

What is homeostasis

Answer 1

A state of balance between you cells, tissues, organs, organ systems

That your blood stays in a pH level range

That your blood glucose remains within a certain range

That you internal body temperature stays within a certain range

Question 2

What does endotherm means

Answer 2

Warm blooded

Our body works hard to keep the internal temperature the same.

Question 3

What is negative feed back

Answer 3

Is when some variable triggers a counteracting response. In order to come back to some set point

Negative feedback loop

Question 4

Negative feed back in body temperature too hot

Answer 4

If you are too hot

Nerves which act as sensors tell the brain you too hot

Brain will send signal to counteract this heat

Sweat gland sweat, heat is lost as sweat evaporates off of your skin

You skin becomes red due to your blood vessels are getting wider

Helps lower the body temp

Question 5

Negative feedback too cold

Answer 5

Too cold

You neurons tell your brain and brain the sends signs to stop sweating

You muscle contractions of shivering can generate heat

Blood vessels will now decrease to help conserve heat

Increasing you body temperature

Question 6

Negative feed back in the regulation of your glucose

Answer 6

When blood glucose is too high

Hormone insulin is released

Insulin has the ability to make cells take in glucose

When glucoses is too low

Hormone glucagon is released

Cause the liver to release glucose into the blood

Question 7

What is positive feedback

Answer 7

Is when instead of getting a counteracting response to some veritable you intensity the variable

Question 8

When a baby is being born

Answer 8

Pressure is placed on the cervix

Causing it to contract

More release of hormones will equal more contractions and pressure which will cause more release of hormones

More hormones more contractions

Question 9

Feedback systems can help us why

Answer 9

To see if there is a problem in the feedback system

For example type one diabetes

When the pancreas which is an organ that is involved in making some hormones like insulin is not working

Insulin is not produced

Your not going to be able to get glucose into you cells

You need to take the glucose in to be able to survive

Question 10

Survival needs

Answer 10

Nutrition

Oxygen

Water

Maintenance of body temp

Maintenance of pressure

Question 11

Homeostasis

Answer 11

The ability to maintain a relatively stable internal environment despite fluctuation in external environment

Question 12

Examples of homeostasis

Answer 12

Blood sugar control

Blood levels of calcium, sodium etc

Body temperature

Blood pressure

PH of blood and other tissues

Question 13

Negative feedback

Answer 13

The output of a system shuts off the original stimulus

So the mechanisms causes change in the opposite direction to the original change

Question 14

Heat transfer

Answer 14

Heat is a form of energy, cannot be creators or destroyed, only transferred

Radiation
Convection
Conduction

Temperature is a quality, measured in Celsius

Question 15

Control of body temperature

Answer 15

To cool down
Perspiration
Blood moves to periphery

Loose clothing
Movement of air

To warm up 
Blood moves away from periphery
Shivering
Piloerection 
Layers of clothing
Increased activity

Question 16

Core and peripheral temperatures

Answer 16

Core 37°

Question 17

Blood sugar control

Answer 17

Blood sugar goes up

Detected by pancreas

Release of insulin

Sugar enters cell, glucose converted to glycogen in liver and muscles, and to adipose tissues

Question 18

Positive feedback

Answer 18

The response enhances the original stimulus

Usual in health, as inherently unstable, is often a feature of disease

The change proceeds in the same direction as the original stimulus

Not appropriate way to regulate moment by moment
in health is used for one off or self limiting events
Blood clotting
Childbirth
Lactation

Question 19

Lacking

Answer 19

Baby suckles at breast

Sensory receptors in the skin of the breast detect the sucking send impulses to hypothalamus

Hypothalamus signals posterior pituitary to release oxytocin

Oxytocin released in blood stimulates milk ejection from the breast

Question 20

Positive feedback is often a feature of disease

Answer 20

Hypertension damage kidneys

Diseased kidneys lack blood flow

Kidneys cause systemic increases in blood pressure

Blood pressure rises

Question 21

Or helpful feedback goes wrong

Answer 21

Platelets adhere to damaged vessels and other plaelets

Will stick to vessel wall damaged by disease

So material builds up inside blood vessel

Cannot break down fat enough and vessel blocked