BOHA - 4

Question 1

eating is a behaviour so there must be a causation what is it?

Answer 1

hormones - leptin = released from fat storage less hunger and ghrelin released from the stomach = more hunger

Question 2

what is the motivation to mate controlled by in mammals and birds?

Answer 2

balance between hormones, testosterone, oestrogen , progesterone

Question 3

what is the difference between hunger and sexual motivation?

Answer 3

hunger restores a physiological balance mating does not

Question 4

how do animals maintain regular behaviours?

Answer 4

biological rhythm of internal clock and concept of zeitgeber

Question 5

what are biological rhythms called?

Answer 5

Circadian rhythms

Question 6

how long are biological clocks?

Answer 6

difference length clocks for different things

Question 7

what are the 4 lengths of rhythms and examples ?

Answer 7

1) very short - heartbeat
2) circadian (24 hour) - sleeping
3) circalunar - (monthly) - menstrual cycle
4) circannual - (yearly) - reproduction

Question 8

what controls the onset of reproduction in birds?

Answer 8

Pituitary hormones

Question 9

what was difficult about the discovery of how internal clocks work and what new science has aided in it?

Answer 9

• difficult due to such tiny amount of hormones being released
• The introduction of radio-immunoassay led to a massive increase in precision e.g can use luminescent paint to see which parts of brain release hormone in response to the light

Question 10

what are 2 benefits and 2 costs of testosterone?

Answer 10

benefits=
1) promotes sperm production 
2) activates sexual behaviour 
Costs=
1) suppresses the immune system 
2) stimulate aggressive behaviour

Question 11

what is zeitgeber and an example of it?

Answer 11

a cue in the regulation of the bodies circadian rhythms e.g sunlight regulates our bodies after jetlag

Question 12

what are higher levels of testosterone correlated with?

Answer 12

increased extra pair copulation