3. Spermatogenesis, Oogenesis, fertilization and implantation. Spermatogenesis, the origin and development of the sperm cells within the male reproductive organs, the testes. The testes are composed of numerous thin, tightly coiled tubules known as the seminiferous tubules; the sperm cells are produced within the walls of the tubules. Within the walls of the tubules, also,are many randomly scattered cells, called sertoli cells, that function to support and nourish the immature sperm cells by giving them nutrients and blood prodcts.
It is found second rate compared to the uterus and back to the urinary bladde. The male reproductive system: the male reproductive system organs are testes, prostate glands, sperm ducts, urethra and penis *Sperm duct during sex, the released sperm cells pass through the sperm ducts. *Testes These are oval organs about the measure of substantial olives that lie in the scrotum, secured at either end by a structure called the spermatic rope. Most men have two testicles. The testicles are in charge of making testosterone, the essential male sex hormone.
This is reflected in figure 2 with those points I referred to before. Zygomycota, Ascomycota and Basidiomycota all perform sexual and asexual reproduction just in different ways. Their structure is the biggest part of that, Zygomycota produces balloon like spores at the end of hyphae, Ascomycota form sacs of psores at the end of conidia and Basidiomycota form densely packed hyphae. After all this examination we found that our hypothesis was correct, the sexual structures were different. Each and every fungus ends the same but takes a different route in sexually
Instead, axons from two groups of hypothalamic neurons - the supraoptic nucleus (SON) and paraventricular nucleus (PVN) – terminate in the posterior pituitary. These specialized neurons produce the hormones ADH (antidiuretic hormone), also known as vasopressin, and oxytocin. When a person becomes dehydrated, osmoreceptors in the brain trigger ADH release into the systemic circulation. ADH travels to the kidneys where it promotes water reuptake in the epithelial cells lining the collecting ducts. The exact mechanism of action of ADH remained obscure until 1990, when Peter Agre discovered a class of protein channels, now called aquaporins, which selectively allow water molecules to cross the cell membrane.
(Campbell, 2009) The portal blood, which is carried by veins and don’t go straight to the heart, carries the gonadotropin to the pituitary gland. Here it triggers its own receptor which then goes on to activate calcium and protein kinase C. The activity of gonadotropin is very low during childhood, and starts up during puberty or adolescence. During the time that a persons’ reproductive years there is a pulse activity that is crucial for having successful reproductive function. Although, after the pregnancy is official, the gonadotropin occurrences are no longer needed. The next hormone is thyrotropin, which is another releasing hormone.
Puberty is a very peculiar age because a lot happens to the students and they become more aware of who they are and many changes affect them. At this age, students have already formed groups and they identify with their friends (Collins, 1984). Their personalities develop and they begin to discover things about themselves. During this stage of development,
This finding is similar to the cross sectional study conducted by Yasmin et al. on factors associated with stress among 800 adolescents. The study findings showed that only 392 adolescents (49%) had information about body changes prior to puberty. Among female adolescents who had prior discussion about puberty, the mean estimated stress score decreased by -1.312 and it was revealed that the information regarding pubertal body changes prior to puberty (p knowledge, attitude, and behavior, the girls were educated for three months by health teachers regarding physiologic, psychologic, physical and other information about puberty. The result of the study revealed that the mean score of female adolescent’s healthy behaviour were significantly increased at the end of the educational course from 37% to
Variations in the onset and duration of the pubertal growth spurt may affect the final size of different craniofacial structures.9,30 Longitudinal studies have shown that growth changes during adolescent growth spurt are more pronounced in the mandible as compared to the maxilla.9,31,32 The current study reports that the onset of pubertal growth peak occurs around four months earlier in girls as compared to boys but there was no significant difference in the overall duration of the pubertal growth peak between the two genders. A review of literature also shows insignificant differences in the duration of pubertal growth peak between boys and girls.24 Late onset of adolescent growth spurt accompanied by continued post-pubertal increase in mandibular
Some adolescents will be trying out drugs, alcohol as well as sexuality that may be from peer-pressure, as during this time, their appearance will be taken special notice of. As children’s bodies begin to change in shape and develop into their adult height and body, emotional and social transformations will take place as the adolescents are trying to adapt to these physical changes. Puberty is the trigger of all these changes. Two kinds of physical changes that take place during puberty are the primary sex characteristics and the secondary sex characteristics.