Embryo past paper 2

Oxyphil cells:

• Inhibit osteoclast activity

• Are also called principal cells

• Involved in the oxidation of long chain fatty acids

• Increase osteoclast activity

Acrosome phase of spermiogenesis:

• Acrosomal cap formed

• Sperm binds to ZP3 protein

• Acrosin released

• Histone replaced with protamine

Anti-Müllerian substance is secreted by:

• Leydig cells

• Ductus epididymis

• Seminiferous tubules

• Sertoli cells

Epithelium of seminal vesicles:

• Pseudostratified columnar

• Non-keratinised stratified squamous

• Simple cuboidal

• Stratified cuboidal

A primary follicle:

• Contains primary oocyte

• Primary oocyte arrested in metaphase of meiosis I

• Secondary oocyte arrested in metaphase of meiosis II

• Contains second polar body

Graafian follicle contains:

• Cumulus oophorus

• Polar body

• Zona pellucida

• Theca lutein

Estrogen surge causes:

• LH surge

• FSH surge

• Progesterone surge

• Ovum release directly

Theca interna secretes:

• Progesterone

• Androstenedione

• Estrogen

• Estriol

Progesterone is:

• Maintains corpus luteum

• Produced by corpus luteum in second trimester

• Produced from androstenedione

• Produced by placenta after corpus luteum degenerates

Peg cells in uterine tube:

• Produce decapacitation factors

• Have no cilia

• Form glycoprotein membrane

• Present in isthmus