Reproductive Phase of Life in Humans


“The phase during a individual’s life during which there is production of gametes is called reproductive phase. In females, it is between 13 to 50 years and in males, it is from the age of 13, life-long. When the follicle

Role of Hormones in Initiating Reproductive Function


Hormones are chemical messengers that regulate most functions in the human body. Endocrine glands or ductless glands secrete hormones directly into the bloodstream. Sex hormones control the onset of puberty and initiate the reproduction function. Body changes such as the

Secondary Sexual Characters


“While primary sex characteristics are those that are present at birth, secondary sex characteristics are those that appear during puberty. These secondary sex characteristics are caused by hormones released at the time of puberty, which usually is around two years

Changes at Puberty girl


“You will grow taller. Your breasts and hips start to grow and your body will have more curves You will grow hair under your arms and between your legs The hair on your legs might get darker and some girls

Changes at Puberty boy


“Boys gain weight. Shoulders get wider. Muscles start to get bigger and stronger. You may notice that you are geting an ‘Adam’s apple’. This is your larynx or voice box getting larger and sticking out at the front of your

Adolescence and Puberty


“Puberty is the time in which a child’s sexual and physical characteristics mature. It occurs due to hormone changes. The exact age a child enters puberty depends on a number of different things, such as a person”s genes, nutrition, and

Asexual Reproduction


“Asexual reproduction is a mode of reproduction by which offspring arise from a single organism, and inherit the genes of that parent only; it is reproduction which almost never involves ploidy or reduction. The offspring will be exact genetic copies

Young Ones to Adults


“On hatching from eggs of the insects do not resemble their parents. To attain the maturity and to become adults, these young ones have to pass through different stages of development assuming distinctly different morphological forms. These morphological forms may

Viviparous and Oviparous Animals


“Oviparous animals are animals that reproduce by laying eggs. This is how most fish, amphibians, reptiles, insects, and arachnids reproduce. All birds and monotremes also reproduce like this. Most animals that live on land lay eggs that are protected by

Development of Embryo


“The term embryo applies to the earliest form of life, produced when an egg is fertilized by a sperm. The fertilized egg is called a zygote. Shortly after fertilization, the zygote begins to grow and develop. It divides to form

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