Answer the following questions .
1. Write names of all human endocrine glands and hormones secreted by them. 2. What is menstruation ? Explain.
3. A rocket has been fired upwards to launch a satellite in its orbit. Name the two forces acting on the rocket immediately after leaving the launching pad.
4. Draw figures of Ursa Major and Orion constellations.
5. Do all the stars in the sky move ? Explain.
Answers
Answer:
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Explanation:
1)The endocrine system is a system of glands that involve the release of chemicals called hormones endocrine glands are also known as ductless glands as they do not have any ducts of their own they pour their secretions directly into to bloodstream the endocrine system regulate metabolism growth development and property of the body it plays an a part in controlling your mood the major glands that make up the endocrine system include hypothalamus, pituitary ,thyroid, parathyroid ,adrenals, pineal and reproductive glands (ovaries and testes) one of the hormones released by pituitary gland is growth hormone it regulates the growth and development of the body the thyroid gland releases thyroxine that regulate the metabolic rate of various body functions if enough thyroxine is released by the thyroid gland the thyroid gland swell up and cause a bulge in the neck region this diseased condition is called goitre it usually occurs due to the deficiency of iodine in the diet insulin a hormone released by pancreas lower the blood glucose level if it is not secreted insufficient quantities the person is said to be suffer from the disease called diabetes the adrenal glands are tiny organs that are located on the top of each kidney they released Adrenaline a hormone which controls the the response of body to stressful situations they also release hormones which regulate the mineral levels in the blood
2) in females the ovaries become active when girl reaches puberty this is normally between 11 to 13 years of age one ovum in one of ovary become mature once in 28 days the mature ovum enters in oviduct where it may get fertilised
If fertilised it develops and reaches the uterus a pear shaped structure between the ovaries uterus is a muscular and elastic and can grow stretch and expand many times its size when the foetus grow and develop inside it before the embryo enters the uterus it prepares itself to receive it by forming a thick lining of blood vessels if fertilization doesn't occur the egg disintegrates and the lining of blood vessels is shed off the process of blood flow from vagina is called menstruation it last 3 to 6 days the first menstrual flow is called Menarche
3) the two forces acting on the rocket immediately after leaving the launching pad are the downward gravitational force (mg) and upward the reaction due to the thrust by the fuel (FT)
5) no the stars do not move in the sky the pole star is located above the axis of rotation of the earth in the north direction does it appear stationary at a point in the sky it doesn't move in the sky all other stars in the sky appear to move from east to west in the sky
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