Topic 7 Flashcards Preview

GCSE Edexcel Biology grade 9-1 course, topics 6-9 > Topic 7 > Flashcards

Flashcards in Topic 7 Deck (200)
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61

describe the process of IVF.

•The woman's natural menstrual cycle is suppressed with medication

•FSH and LH are used to stimulate the ovaries to produce more eggs than normal

•the eggs are monitored and hormones are used to help them mature

•the eggs are collected

•the eggs are out in contact with the sperm and left for a few days to fertilise

•one or two embryos are placed into the womb

62

How are hormones used in IVF?

FSH and LH are used to stimulate egg production so that more than one egg can be collected for IVF

63

What is clomifene therapy?

Clomifene therapy is a drug treatment to stimulate ovulation.

64

How does clomifene therapy work?

•Clomifene is a drug which blocks the effect of oestrogen, this makes the body increase the amounts of the two hormones essential for ovulation: FSH and LH.

•FSH causes the eggs to mature in the ovaries and LH triggers the release of one or more mature eggs from the ovaries (ovulation)

•by knowing when the woman will be ovulating the couple can have intercourse during this time to increase the chance of becoming pregnant.

65

What is the target organ for insulin?

The liver or a muscle

66

When insulin is present which substance is formed from glucose in the target cells?

glycogen

67

Why must blood glucose concentration be controlled?

To maintain a constant internal environment for the body's enzymes to function correctly. Too little or too much glucose can damage organs, resulting in unconsciousness or death.

68

What is the cause of type 1 diabetes?

the person's insulin-producing cells have been destroyed, so they do not release insulin.

69

Which parts of the body are involved in thermoregulation in the epidermis?

the sweat pore and hair

70

Which parts of the body are involved in thermoregulation in the dermis?

•sweat gland
•blood vessels
•fat layer
•temperature receptors
•oil gland
•hair erector muscle

71

what is the function of the blood vessel near the skin's surface in thermoregulation?

it helps regulate body temperature by vasoconstriction and vasodilation

72

what is the function of the hair erector muscle in thermoregulation?

it contracts to make hairs stand upright when the body is too cold and relaxes to make hairs lie flat when the body is too hot

73

what is the function of the sweat pore in thermoregulation?

secretes sweat produced by the sweat gland on to the surface of the skin

74

what is the function of the hair in thermoregulation?

controlled by the hair erector muscle. when upright traps an insulating layer of air on the skin surface to increase body temperature

75

what is the function of the epidermis in thermoregulation?

provides a waterproof barrier on the skin surface

76

what is the function of the dermis in thermoregulation?

provides flexibility and strength to the skin

77

what is the function of the sweat gland in thermoregulation?

produces sweat to be secreted by the sweat pore. helps with thermoregulation when the body is too hot

78

what is the function of the fat layer in thermoregulation?

insulates the body and gives an extra padding layer t the skin

79

what is the function of the sensory cells in thermoregulation?

respond to stimuli and transmit information to the brain. provide information about the external temperature to the brain

80

What is the name of the condition in which the body gets too cold? What does this lead to?

hypothermia, death

81

What is the name of the condition in which the body gets too hot? What does this lead to?

heat stroke, death

82

what are the structures in the urinary system?

•kidney
•renal artery
•renal vein
•ureter(s)
•bladder
•sphincter muscle
•urethra

83

what is the function of the kidney?

filters the blood

84

what is the function of the renal artery?

transports blood containing waste from the body to the kidney

85

what is the function of the renal vein?

transports blood with waste removed to the body

86

what is the function of the ureter(s)?

tube that connects each kidney to the bladder, urine flows down it

87

what is the function of the bladder?

stores urine

88

what is the function of the sphincter muscle?

controls the bladder opening and closing

89

what is the function of the urethra?

tube that urine flows out of the body from

90

where does the filtration of blood happen in the kidney?

in the cortex