Sexual reproduction
- Created by: lavithedemon
- Created on: 15-04-16 09:14
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- Sexual Production
- spermatogenesis and oogenesis both involve mitosis, cell growth, two divisions of meiosis and differentiation
- oogenesis - production of egg cells
- primary follicle
- mature follicle
- secondary oocyte
- mature follicle
- primary follicle
- spermatogenesis - production of sperm
- seminiferous tubules - narrow tubes
- interstitial cells - interstices
- germinal epithelium - outer layer of the cells
- spermatozoa
- Sertoli cells
- spermatozoa
- germinal epithelium - outer layer of the cells
- interstitial cells - interstices
- seminiferous tubules - narrow tubes
- oogenesis - production of egg cells
- Processes in speratogenesis and oogenesis result in different numbers of gametes with different amounts of cytoplasm
- fertilisation involves mechanisms to avoid polyspermy
- Acrosome reaction - the zona pellucida is destroyed by the content of the acrosome when one sperm attaches to the egg
- penetration of the egg membrane - sperm membrane binds to egg membrane and fuse together
- cortical reaction - cortical granules avoid that other sperms fertilise the egg
- fertilization in animals can be internal or external
- implantation of the blastocyst in the endometrium is essential for the continuation of pregnancy
- hCG stimulates the ovary to secrete progesterone during early pregnancy
- prevention of the distruction of the endometrium
- the placenta facilitates the exchange of materials between the mother and the embryo
- fetal tissues
- placental villus
- maternal blood flows in the inter villuos spaces around the villi
- placental barrier
- oxygen, carbon dioxide, glucose, antibodies, water
- Estrogen and progesterone are secreted by the placenta once it has formed
- Birth is mediated by positive feedback involving estrogen and oxytocin
- oxytocin stimulates contractions of the muscle fibres
- uterine contractions
- spermatogenesis and oogenesis both involve mitosis, cell growth, two divisions of meiosis and differentiation
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