module 5

Question 1

Gas exchange

Answer 1

• controlled by physical factors
• fick’s law: rate of diffusion = SA x partial pressure gradient x diffusion coefficient / diffusion distance

Question 2

Gas exchange in human lungs

Answer 2

1.

Question 3

Explain sex determination in human

Answer 3

• determined by the SRY gene which is present on the Y sex chromosome
• in early embryonic development there are bi-potential gonads (indifferent)
• if SRY gene is present, testes develop
• if SRY gene is absent, ovaries develop
• to be a female you dont need to be XX

Question 4

What are the 3 major steroid sex hormones produced by the gonads

Answer 4

androgen (testerone), oestrogens (oestradiol), profesterone
female and male produce all but at different quantities

Question 5

Folliculogenesis

Answer 5

development of the follicle (included egg, fluid accumulation, theca cells and granulosa cells) which prepares the egg for ovulation and fertilisation

Question 6

oogenesis

Answer 6

formation of a mature ovum from the oogonia
oogonium (2n) –> primary oocyte (2n) –> secondary oocyte (n)–> ootid (n) –> ovum (egg)(n)