Homeostasis

Question 1

What are 3 ways of reducing body temp

Answer 1

1. Sweating from glands will evaporate
2. Hair lies flat so skin less insulated so more heat loss
3. Vasodilation: arterioles bear surface of skin dilate causing more blood to capillaries so more loss by radiation

Question 2

How can you increase body temp

Answer 2

Opposite mechanisms for reduce as well as: shivering to make muscles contract so more respiration

Also hormones like adrenaline increase metabolism so more heat produced

Question 3

What controls body temp

Answer 3

Thermoregulation

Question 4

Describe ‘in-cell’ hormone transcription factors

Answer 4

Steroid hormones cross cell membrane, enter nucleus and bind to transcription factors altering gene expression

Question 5

Describe out of cell hormones

Answer 5

Protein hormones cannot cross cell membrane

1. Instead they bind to specific receptor in CSM which activates a messenger molecule in cytoplasm
2. These activate enzymes which activate transcription factors