Mod 8

Question 1

Negative feedback loop steps

Answer 1

1. STIMULUS
   A change occurs in internal condition
2. RECEPTOR
   Detects change
3. EFFECTORS
   Muscles, organs and glands carry out the…
4. RESPONSE

Question 2

Define homestasis

Answer 2

The process by which an organism maintains a stable internal environment, despite fluctuating external environment conditions. It involves enormous coordination of an organism.

Question 3

Define stimulus

Answer 3

A change in the ambient or internal environment such as an increase or decrease in temperature.

Question 4

Positive feedback

Answer 4

Maintains the negative feedback response: changing or amplifying its output.

Question 5

Endocrine system role

Answer 5

Hormones interact with specific receptors on specific cells to initiate a desired response to achieve homeostasis.

Question 6

Endorcrine stimiulus

Answer 6

Humoural: change in concentration of specific hormones
Neural: neurons stimulate the secretion
Hormonal: the pituitary gland secretes hormones to control the hormones secreted by other glands.

Question 7

Role of the kidney

Answer 7

Osmoregulation: removing nitrogenous wastes from the bloodstream to maintain optimal levels of substances such as salts and water.

Filtration
Absorption
Secretion

Question 8

Pros / cons of haemodialysis

Answer 8

PROS:
Allows removal of metabolic waste (urea).
Provides a long term solution for long implantation lists.
Accessible: offered by most hospitals.

CONS:

Limited to passive transport: not accommodating for all solutes.
Timely: 3-5 hrs
3 x a week.
Limits means of travel.
Regulated diet and fluid consumption.
Non Curative.