What do hormones control? Things like menstruation in women as well as the changes that occur to our bodies during puberty and homeostasis. Where do hormones have an effect? On target organs. State 3 places in the body where hormones are produced. Brain, testis, pancreas, adrenal gland, ovary and thyroid gland. How do hormones travel around the body? In the blood. What is a gland? Parts of tissues and organs in the body that secrete substances e.g. hormones. Factor controlled by Description homeostasis Water content Water leaves the body by: lungs when we breathe out, skin when we sweat, kidneys in the urine Ion content Ions are lost by: skin when we sweat, kidneys in the urine Temperature To maintain the temperature at which enzymes work best for chemical reactions in the cells. Normal body temperature is 37oC Blood glucose levels Controlled by the pancreas to provide the cells with a constant supply of energy. Describe how a person can conserve water in a survival situation. - Avoid exercise, stay in the shade, don’t lie on hot ground, don’t eat, don’t talk and breathe through your mouth. What is the menstrual cycle? The reproductive cycle in women controlled by hormones. How long does the menstrual cycle last? 28 days. At what day in the month of the menstrual cycle is the egg released? 14th What is the role of follicle stimulating hormone (FSH)? Where is it produced? Causes the egg to mature stimulates ovary to produce oestrogen produced in the pituitary gland. What is the role of luteinising hormone (LH)? Where is it produced? Triggers release of egg from the ovary produced in the pituitary gland. What is the role of oestrogen? Where is it produced? Stimulates the lining of the womb to develop and stimulates pituitary gland to make LH produced in the ovaries. If an egg is not fertilised what happens? The lining of the womb breaks down and the egg leaves the body in a period. How do contraceptives use hormones to control fertility?
What do hormones control? Things like menstruation in women as well as the changes that occur to our bodies during puberty and homeostasis. Where do hormones have an effect? On target organs. State 3 places in the body where hormones are produced. Brain, testis, pancreas, adrenal gland, ovary and thyroid gland. How do hormones travel around the body? In the blood. What is a gland? Parts of tissues and organs in the body that secrete substances e.g. hormones. Factor controlled by homeostasis Description Water content Water leaves the body by: lungs when we breathe out, skin when we sweat, kidneys in the urine Ion content Ions are lost by: skin when we sweat, kidneys in the urine Temperature To maintain the temperature at which enzymes work best for chemical reactions in the cells. Normal body temperature is 37oC Blood glucose levels Controlled by the pancreas to provide the cells with a constant supply of energy. Describe how a person can conserve water in a survival situation. - Avoid exercise, stay in the shade, don’t lie on hot ground, don’t eat, don’t talk and breathe through your mouth. What is the menstrual cycle? The reproductive cycle in women controlled by hormones. How long does the menstrual cycle last? 28 days. At what day in the month of the menstrual cycle is the egg released? 14th What is the role of follicle stimulating hormone (FSH)? Where is it produced? Causes the egg to mature stimulates ovary to produce oestrogen produced in the pituitary gland. What is the role of luteinising hormone (LH)? Where is it produced? Triggers release of egg from the ovary produced in the pituitary gland. What is the role of oestrogen? Where is it produced? Stimulates the lining of the womb to develop and stimulates pituitary gland to make LH produced in the ovaries. If an egg is not fertilised what happens? The lining of the womb breaks down and the egg leaves the body in a period. How do contraceptives use hormones to control fertility?
PiXL%20AQA%20ANSWERS%20to%20Knowledge%20Test%20Unit%201%20B1%20GCSE%20Science%20A%20for%20certification%20June%202014%20onwards.docx