Fertilization and hormones to get there
16 important questions on Fertilization and hormones to get there
What is embryological development? What is the study during this time called?
What is fetal development?
Fetal development begins at the start of the ninth week and continues until birth.
What happens to most of the binucleated oocytes?
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What are causes of abnormal sperm?
- Infections
- Exposure to toxins
- Varicocele (veins in scrotum)
- Fever + extreme heat
- Lifestyle
- Drug + alcohol use
- Testicular abnormalities
Where does fertilization occur and when?
What are the steps of penetration of zona radiatia & zona pellucida?
- Chemoattraction, binding & docking
- Acrosomal reaction (=exocytosis)
- Hyperactivity & penetration through ZP
- Fusion of plasma membrane
- Sperm nucleus enters egg cytoplasm
What happens at the first calcium wave that activates the oocyte?
- Exocytosis of vesicles (cortical granules) located interior to oocyte membrane prevents polyspermy
- Completion of meiosis II, formation of 2nd polar body
- Activation of enzymes -> increase in metabolic rate
What is the exact moment of conception?
What is typical about steroid hormones?
What is a secondary effect of testosterone?
What is erectile dysfunction?
What are causes of erectile dysfunction?
- Cardiovascular
- Neurological/psychological
- Hormonal
- Drugs (of abuse)
How can erectile dysfunction be treated?
What are the two types of sex pheromones?
- Signal pheromones
- Primer pheromones
What are the characteristics of signal pheromones?
What are the characteristics of primer pheromones?
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