Spermiogenesis

Question 1

What is spermatogenesis?

Answer 1

Spermiogenesis is a process by which seminiferous tubeles in the testicles produce sperm cells.

Question 2

What is the testis composed of?

Answer 2

The testis is composed of lobules, each contains 1-4 seminiferous tubeles which produce spems

Question 3

What are leydig cells and where are they

Answer 3

Between the seminiferous tubeles, there are a grp of Leydig cells (interstitial cells) which produce the male sex hormone testestorone.

Question 4

In what direction does spermatogenesis happen

Answer 4

Spermatogenesis takes place in the seminiferous tubeles in a centripetal direction (basal lamina to the lumen.)

Question 5

Name the phases of spermatogenesis

Answer 5

Multiplication
Growth
Maturation/Meiosis
Differentiation/Spermiogenesis

Question 6

Multiplication of spermiogenesis

Answer 6

-multiplication is characterized by mitosis.

-Spermatogonia are diploid cells that divide by mitosis from puberty till death

Question 7

where are the spermatogonia located

Answer 7

-the male undifferentiated sperm cells or spermatogonia are located against the basal lamina.

Question 8

growth spermatogenesis.

Answer 8

spermatogonia undergoes interphase where duplication of DNA and synthesis of RNA and proteins takes place.

SPERMATOGONIA enlarge and become PRIMARY SPERMATOCYTES/SPERMATOCYTES 1

Question 9

meiosis sperm.

Answer 9

PRIMARY SPERMATOCYTES undergo meiosis 1 to give 2 haploid SECONDARY SPERMATOCYTES/SPERMATOCYTE 2

SECONDARE SPERMATOCYTES goes through meiosis 2 to give 4 haploid SPERMATIDS

Question 10

Spermatogonia/differentiation

Answer 10

each spermatid undergoes cellular transformation to become mature sperm cells.

Question 11

sertoli cells

Answer 11

sertoli cells sustains and nouriches the daughter cells of spermatogonia

Question 12

where are the sertoli cells located?

Answer 12

inside the seminiferous tubels

Question 13

what are the changes that happen during spermatogonia

Answer 13

golgi bodies -> acrosome (contains enzymes that pentrate the membranes of the ova.

centriole -> tail/flagellum

mitochondria -> midpiece (energy)

cytoplasm is eleminated

Question 14

schematize the spermatogonia phase

Question 15

What are the chr fomulas in the dif phases of spermatogenesis

Answer 15

Multiplication :spermatogonia 2n=46/1 tid

Growth: Spermatocyte 1: 2n=46/2tids

Maturation: M1: spermatocyte 2: n=23/2 tids
M2: spermatids: n=23/1 tid

Diffrentiation: sperm cell n=23 1 tid

Question 16

schematize the seminiferous tubeles