Question
Describe the human male reproductive system.
✓
Answer
In human male reproductive system, the reproductive organs are as follows:
- Testes, different types of duct systems and glands.
- Testes are in pair. Each testis lies in the scrotum which lies outside to abdominal cavity.
- Testes -consist of numerous seminiferous tubules. The germinal epithelium of seminiferous tubules form sperms by undergoing meiosis.
- These sperm cells are immature.
- They are pushed gradually through various duct systems till the penis.
- This path is as follows:
Rete testis → vas efferentia → epididymis → vasa deferentia → Ejaculatory duct → urethra - As the sperms are travelling, they gradually become mature. They are made capable to perform process of fertilization.
- Seminal vesicles (in pairs), Single prostate gland and a pair of Cowper’s glands secrete their secretions. These secretions and the sperms together form semen.
- This semen is deposited in the vagina with help of penis.
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Locomotion is considered as an important j characteristics of the animals. However, animals belonging to Porifera are said to be sedentary. Every 1 other phylum has typical locomotory organs. E.g. Nereis crawls with the help of parapodia, whereas earthworm buries in soil by setae. Spiders have four pairs of walking legs, crab has five while all insects have three pairs of walking legs. The walking legs are also called appendages. Starfish moves with the help of tube feet. Snails and bivalves use muscular foot for locomotion. Birds flying with their spread out wings and fish swimming with their fins, both have spindle-shaped body tapering at both the ends. While flying or swimming such body offers least resistance during locomotion. Mammals have two pairs of limbs while animals like snakes are limbless. Other animals belonging to the class of snakes also have very weak limbs which make them creep on the ground.
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(1) What are the locomotory organs in phylum Annelida?
(2) Which phylum has a characteristic of jointed appendages?
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