The science of how Messi keeps the ball close to himself photo credit: ZaleDesigns Messi is a magician with the ball at his feet. He's in my opinion the best player in the sense that he can control the ball so well, runs so fast with the ball & changes the direction at full speed like it's a walk in the park. For starters he started playing very early (at 3) which is crucial if you want to be a good player. In that aspect, he's God gifted as he had dribble skills which is genetic in my opinion. Height He is short which means a low center of gravity so it's difficult to push him off the ball. That's why we see that anyone rarely can topple him down, instead players much larger than him lose possession to him. So his short height suits his style of play & is a blessing in disguise. Change of pace Messi changes his pace really well. He starts slow and runs directly at the defender which means the defender has to stop & focus on him. When he reac...
Reaching the Age of Adolescence
Introduction
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| girl smilling |
The phase of life, when the body undergoes radical changes, leading to reproductive maturity, is known as adolescence.
Adolescence normally begins around the age of 11 and lasts up to 18 or 19 years of the age. However, the phase of adolescence varies from person to person.
Starting from thirteen (13) to nineteen (19), ‘teen’ is suffix and common in every number; therefore, adolescents are also known as ‘teenagers.’
In girls, adolescence phase may begin one year or two years earlier than the boys.
During the adolescence phase, the human body undergoes several changes, which are marked as the onset of puberty.
The most important change, which marks puberty, is that the boys and the girls become capable of reproduction.
Puberty, however, ends when an adolescent phase attains reproductive maturity.
Changes at Puberty
The most conspicuous change during the puberty is the swift increase in height.
In the beginning, girls grow faster than boys, but by reaching 18 years of the age, both attain their maximum height.
The rate of body growth (in terms of height) varies from person to person.
The changes occurring in adolescent boys and girls are also much different.
At puberty, especially the boys’ voice boxes or the larynxes begin to grow and develop larger voice boxes.
The growing larynxes in boys can be seen as a protruding part of the throat; it is known as Adam’s apple.
In girls, the larynx is small; hence, it is not visible from the outside.
Adolescence is also the phase of change in a person’s way of thinking.
Hormones, which are the chemical substances, are responsible for the changes in adolescence.
The testes (in boys), at the onset of puberty, release testosterone hormone.
Once puberty is reached in girls, ovaries begin to produce the hormone namely estrogen; it is responsible to the breasts develop.
Endocrine glands release hormones directly into the bloodstream.
In the body, there are many endocrine glands or ductless glands.
The sex hormones are under the control of hormones released by the pituitary gland.
Reproductive Phase of Life in Humans
At puberty, the released egg (in women), and the thickened lining of the uterus along with its blood vessels get shed off in the form of bleeding known as menstruation.
The first menstrual flow begins at puberty and is known as menarche.
Menstruation occurs once in about 28 to 30 days.
By the age of 45 to 50 years, the menstrual cycle stops, which is known as menopause.
The thread-like structures in the fertilized egg are known as chromosomes.
All human beings have 23 pairs or 46 chromosomes in the nuclei of their cells.
In boys, out of 23 pairs of chromosomes, two chromosomes named X and Y are the sex chromosomes.
In girls, out of 23 pairs of chromosomes, two chromosomes named X and X are the sex chromosomes.
When a sperm carrying X chromosome fertilizes with the egg, the zygote would have two X chromosomes that develop into a female child (as shown in the image given below).
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| sperm |
When a sperm carrying Y chromosome fertilizes with the egg, the zygote would have two chromosomes i.e. X and Y and such zygote develops into a male child (as shown in the image given above).
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