What is Homeostasis?

Question 1

Define stimulus

Answer 1

Stimulus is an event or any change in the external environment that evokes a specific functional reaction in an organ or tissue.

Question 2

Define receptor

Answer 2

Many different types of receptors. Examples: Sensory, Cellular
Detect changes in the internal or external environment, receive signals, send signals

Question 3

Define effector

Answer 3

Effectors bring the system back to the set point (the optimal condition under which the system operates). Effectors can be muscles or glands.

Question 4

Define response

Answer 4

The response of a living tissue or organism to a stimulus.

Question 5

Draw a labelled diagram of a stimulus response model

Answer 5

Draw in book, find answer on OneNote page

Question 6

What is a negative feedback loop? Example?

Answer 6

A negative feedback loop responds to change in the opposite direction, meaning it prevents overcompensation when a response has been triggered. An example is blood glucose regulation.

Question 7

Difference between positive and negative feedback loops? Example?

Question 8

Name 5 main categories of receptors? Example?

Answer 8

Chemoreceptors: Chemical stimulus (odours, taste, pH levels)
Mechanoreceptors: Physical stimulus (touch, sound)
Photoreceptors: Detects light
Thermoreceptors: Change in temperature
Nocireceptors: Intense stimulus (pain)
- Can be interreceptors (internal) or extereceptors (external)

Question 9

Compare the types of stimuli that muscles and and glands respond.

Answer 9

Muscles contract in response to neural stimulation, where as, glands are organs that secrete chemicals and protiends and can respond to both neural and chemical stimulation

Question 10

Draw a feedback control diagram to show the effects of exercise and include both responses to temperature and glucose?

Question 11

Define metabolism

Question 12

Define anabolic

Question 13

Define catabloic reaction

Question 14

Is protein synthesis anabolic or catabolic?

Question 15

Is digestion anabolic or catabolic?

Question 16

Is DNA synthesis anabolic or catabolic?

Question 17

Is photosynthesis anabolic or catabolic?

Question 18

Is cellular respiration anabolic or catabolic?

Question 20

What is the control centre?

Answer 20

This is where the stimulus is processed and interpreted so that can appropriate response can be triggered. Most responses are triggered by the brain, but some organs like the pancreas and hypothalamus can also interpret and trigger responses