homeostasis

Question 1

what is fever?

Answer 1

body’s response to an infection where the core temp rises above 37.5 degrees Celcius

Question 2

what is pyrogen?

Answer 2

a substance that is released by specific immune cells which initiates a fever by acting on the hypothalamus which increases the body’s thermostat

Question 3

describe homeostasis

Answer 3

process of keeping the environment inside the body constant

• makes us independent of our external environment
• body cells work best at optimum temp with particular PH

Question 4

what is the body responsible for regulating?

Answer 4

• core body temp
• ph and concentrations of dissolved substances in bodily fluids
• conc of glucose in the blood
• conc of oxygen in the blood
• blood pressure
• concentration of metabolic wastes

Question 5

what is a steady-state?

Question 6

what are feedback systems?

Answer 6

the circular situation in which the body responds to change or stimulus with the response altering the original stimulus

Question 7

what are the steps in a feedback look (stimulus-response model) and what are their purposes?

Answer 7

1. stimulus = change in the environment that causes a change
2. receptor = cells or tissues that detects a change (specific)
3. modulator = process the message received from the receptor
4. effector = muscle or gland that carries out the response
5. response = result of the effector
6. feedback - positive or negative?

Question 8

what is the difference between positive and negative feedback systems?

Answer 8

negative - response decreases original stimulus, counteracts stimulus
positive - response increases original stimulus, reinforces stimulus

Question 9

how is core temp monitored?

Answer 9

core temp is detected by thermoregulators in the hypothalamus
they detect temp of blood flowing through the brain