lecture 1 - homeostasis

Question 1

what is homeostasis?

Answer 1

The maintenance of a stable internal environment while adjusting to changing external conditions

Question 2

what is it called when blood glucose is too low?

Answer 2

hypoglycaemia

Question 3

what is it called when blood glucose levels are too high?

Answer 3

hyperglycaemia

Question 4

what is negative feedback regulation?

Answer 4

planned corrective beh of any system which brings it back to baseline whenever it moves away from baseline

Question 5

what is the arterial o2 pressure which needs to be regulated?

Answer 5

75-100mmHg

Question 6

what is the steps of the feedforward regulation of homeostasis?

Answer 6

Nerve signals sent to muscle causing contraction – brain stem to motor cortex – needs to increase ventilation

Concurrently (At same time) signals are sent to the respiratory control centre ‘telling’ it that exercise has begun

Consequently, ventilation increases

Question 7

what happens if MAP doesnt increase during exercise?

Answer 7

limited blood flow and o2 to muscles so is impaired … needs to be able to respond to changing external conditions

Question 8

what does afferent mean?

Answer 8

to the CNS

Question 9

What does efferent mean?

Answer 9

from the CNS

Question 10

what does the NS do?

Answer 10

sends signals through nerve cells called neurons to the CNS (afferent) and from the CNS (efferent)

Question 11

what does the endocrine system do?

Answer 11

secretes hormones (chemical messengers) from glands into blood, which travel to and have an effect on distant organs

Question 12

what are disturbances in homeostasis implicated in?

Answer 12

disease