zoology Flashcards
outline the role of FSH and LH in oogenesis
FSH stimulates development of follicles and secretions of estrogens
LH stimulates maturation of follicles and release of ova at ovulation
outline role of FSH and LH in spermatogenesis
FSH stimulates development of seminiferous tubules (where sperm forms)
LH stimulates Leydig cells which secrete testosterone
outline budding
offspring grow out of the body of parent
outline parthenogenesis
virgin birth - unfertilized egg develop into offspring but are not haploid
what is vas deferens
where sperm transfers to penis
what are seminiferous tubes
where sperm is produced
outline role of oestrogen and progesterone
Oestrogen - Enhances growth of follicles and grows endometrium
Progesterone - grows and maintains endometrium and secretes nutrients for embryo
what is the germinal vesicle
where egg cells store there DNA
zona pellucida
the egg cells extracellular matrix that contains glyco proteins
what is the corona radiata
layer of follicle cells Surrounding egg cell
outline incomplete discoidal clevage
with lots of yolks clevage furrow doesnt penetrate to the yolk
a blastodisc forms on top of the yolk
outline incomplete clevage superficial
nuclei migrate to edge of membrame and grows inwards
outline the role on amniotic sack, chorion and allantois roles in bird membrames
amniotic sac - protection
chorion - gas/water exchange
allantois - waste storage
What does meldonium do
increase NO producdtion
increase blood flow
outline neuralation
ectoderm thickens around noto cord
forming ridges which eventually wrap around and form neural tube
