Chapter 10 Spermatogenesis Flashcards Preview

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Flashcards in Chapter 10 Spermatogenesis Deck (25)
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1
Q

LH last 10-20 minutes 4-8 times per day and targets?

A

Lyedig cells

2
Q

FSH occurs in lower concentrations because of inhibin secretion and longer half life but last longer periods. what does FSH target?

A

Sertoli cells

3
Q

The leydig cells in males are similar to what in the female?

A

Theca interna cells of the antral follicles in the ovary

4
Q

What is the overall goal of spermatogenesis?

A

Produce sperm

5
Q

Male GnRH secretion occurs in intermittent, and frequent pulses lasting a few minutes which causes?

A

FSH and LH

6
Q

What do Sertoli cells secrete?

A

inhibin and DHT inhibin (inhibits FSH)

7
Q

T or F. Leydig cells contain membrane bound receptors of LH

A

True

8
Q

T or F. Leydig cells synthesize testosterone upon binding of LH.

A

False, Progesterone. Progesterone is then converted to testosterone

9
Q

T of F. Secretion of testosterone from leydig cells is pulsatile

A

True

10
Q

What function is a pulsatile release of LH necessary to maintain?

A

proper testicular function

11
Q

What happens to LH receptors when there is too much release of LH?

A

become unresponsive

12
Q

What happens when LH receptors become unresponsive?

A

low levels of testosterone production

13
Q

What are the goals of speratogenesis?

A
  1. provide a continuous supply of gametes

2. …

14
Q

Define Spermatogenesis.

A

all cell divisions and all morphologic changes that take place within the semineiferous epithelium

15
Q

Where does spermatogenesis take place?

A

seminiferous tubles

16
Q

What changes the developing germ cell?

A

cell division and morphological changes

17
Q

What are the 3 phases?

A
  1. proliferation phase
  2. meiotic phase
  3. Differentiation phase
18
Q

T or F. developing germ cells are never connected by intercellular bridges

A

False, all stages are connected by intercellular bridges so the cytoplasm is interconnected

19
Q

What does the proliferative phase consists of what kind of division?

A

mitotic divisions of diploid spermatogonia

20
Q

Where is prorliferative mitotic division take place?

A

periphery of a seminiferous tubule near the basement membrane and then move to the lumen as they proliferate

21
Q

Several A- spermatogonia generations go through mitotic divisions to create?

A

I and then B- spermatogonia

22
Q

What are the different spermatogonia phases?

A

A1, A2, A3, A4, I, B

23
Q

What is an important part of the proliferative phase?

A

renewal

24
Q

What is renewal?

A

the ability for some spermatogonia to revert to stem cells allowing those stem cells to later redevelop into spermatogonia
Stem cells are maintained to ensure continuous spermatogenesis

25
Q

How many spermatids can one A- spermatogoia produce?

A

256 spermatids