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Signals for parturition originate from the fully developed foetus and the placenta involving a complex neuroendocrine mechanism. This is also called foetal ejection reflex.
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Meghna Thapar 5 years, 9 months ago
Urine is formed in the kidneys through a filtration of blood. The urine is then passed through the ureters to the bladder, where it is stored. During urination, the urine is passed from the bladder through the urethra to the outside of the body. There are three main steps of urine formation: glomerular filtration, reabsorption, and secretion. These processes ensure that only waste and excess water are removed from the body.
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Meghna Thapar 5 years, 9 months ago
- Male Reproductive System:
The human male reproductive system consists of:
- Testes - Are the primary reproductive organs in males which are in pair. These are oval shaped organs which lie outside the abdominal cavity. It makes the male *** cells called sperms and produces male *** hormones called testosterone. The testes are situated in the scrotal sac outside the main body cavity because the formation of sperms requires a lower temperature than the normal body temperature.
- ******* - Is a muscular pouch which houses the testes. It is present outside the abdominal cavity and maintains a lower temperature than the normal body temperature.
- Epididymis - The sperms formed in the testes goes into a coiled tube called epididymis which stores the sperms temporarily.
- Vas Deferens (sperm duct) - It is a long tube which carries the sperms from epididymis to another tube called urethra.
- Seminal vesicles and prostrate gland - Both these glands are present along the path of vas deferens and add their secretions to sperms which allows them to transport easily.
- ***** - It is an organ which passés the sperms from the man's body into the ****** in the women's body during mating.
The secretions of seminal vesicles and prostrate gland provide nutrition to the sperms and also make their transportation easier by secreting a thick liquid.
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Meghna Thapar 5 years, 9 months ago
Root nodules are found in plants belonging to the family Fabaceae or Leguminosae. They include leguminous plants like beans, peas, peanuts etc. It is formed due to the symbiotic association between the leguminous plant and the host-specific bacteria called the rhizobium.
Multiple interactions are involved in the formation of root nodules:
1) The Rhizobium bacteria divide and form colonies. These get attached to the root hairs and epidermal cells.
2) The root hairs get curled and are invaded by the bacteria.
3) This invasion is followed by the formation of an infection thread that carries the bacteria into the cortex of the root. The bacteria get modified into rod-shaped bacteroides.
4) As a result, the cells in the cortex and pericycle undergo division, leading to the formation of root nodules.
5) The nodules finally get connected with the vascular tissues of the roots for nutrient exchange.
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The dual purpose served by Deoxyribonucleoside triphosphates in polymerization :
(i) They act as substrates for DNA synthesis.
(ii)They provide energy for polymerization reaction. Ina deoxyribonucleoside triphosphates, the two terminal phosphates are high-energy phosphates.
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Meghna Thapar 5 years, 9 months ago
STDs may cause serious, life-threatening complications including cancers, infertility, ectopic pregnancy, spontaneous abortions, stillbirth, low birth weight, neurologic damage, and death. Women and adolescents are disproportionately affected by STDs and their sequelae. Some STIs can spread into the womb (uterus) and fallopian tubes and cause PID. This can lead to both infertility and tubal pregnancy. STIs in women, especially HPV infection, also may lead to cervical and **** cancer. Men can also get penile and **** cancer from HPV infection.
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