E-Lecture - Important Points
- A tissue is a group of cells with a particular function.
- An organ is a group of tissues with a specific function.
- A system is a group of organs with a particular function.
- Sponges are multicellular aquatic, sessile and filter feeder animals.
- Hydra is a multicellular, aquatic and predator animal with tentacles and nervous system for movement.
- Flat worms are invertebrate animals, mostly living as parasites due to undeveloped digestive, movement and sensory organs.
- Round worms are invertebrate animals mostly living as parasites, due to undeveloped sensory and movement organs.
- Segmented worms are also invertebrate animals with circulatory system, sensory system and movement organs. Some of the like such as leeches are parasitic.
- Human male reproductive organs include penis, testes or male gonads for sperm sex hormone production and scrotum or saclike structure enclosing testes for sperm cells maturity.
- Human female reproductive organs include vagina, ovaries or female gonads for egg cells production and sex hormones, fallopian tube for fertilization, uterus for pregnancy.
- Human life cycle involves the infancy, juvenile, adolescence, adult and senescence stages.
- Menstruation, is the bleeding of the an adult female reproductive system to remove unfertilized egg with blood through the vagina.
- Menstruation, is a sign of no pregnancy and no attainment of menopause stage.
- Pregnancy, is the development of embryo into foetus controlled by progesterone hormone.
- Placenta, is a tissue formed during pregnancy for additional progesterone for development of uterus and embryo also to prevent overlapping of pregnancy.
- Umblical cord, is a tube with blood vessels formed during pregnancy to exchange material between the mother and the foetus through blood.
- Pregnancy and STIs are prevented by abstinence and wearing condom also by challenging risky sexual behaviours.
- Contraceptives are methods against conception to prevent unwanted pregnancy. They play role in limiting the number of children within a family and also to prevent the transmission of STI especially condom.
- Drug, is any chemical that impact the body specially, the Central nervous system.
- Drug abuse, is the use of drugs other than the intended medical purpose.
- Drugs can be stimulant, depressant, seducers and hallucinauts the most abuse drugs are alcohol, opiates and narcotics.
Browse Chapter