hormonal communication

Question 1

How is insulin secreted from beta cells

Answer 1

glucose enters the beta cell by facilitated diffusion through glucose transporter, respiration occurs producing ATP, ATP then causes ATP sensitive K+ channels to shut causing the cell to depolarise causing the voltage gated Ca+ channels to open, calcium causes insulin containing vesicles to move towards cell surface membrane and leave cell by exocytosis

Question 2

exocrine

Answer 2

secretes enzymes into a duct

Question 3

effects of cortisol

Answer 3

regulation of metabolism (high cortisol increases metabolism of fat, low cortisol decreases metabolism of fat), released in response to stress

Question 4

hormone released when too cold

Answer 4

thyroxine

Question 5

technical name for hairs standing up

Answer 5

piloerection

Question 6

mechanisms for heat transfer

Answer 6

radiation, evaporation, convection, and conduction