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biology flashcards homeostasis & inheritance

give 3 things that thyroxine does

Any 3 from:
stimulates basal metabolic rate

helps with growth and developement

effects how quickly substances are broken down and built up

how much oxygen your tissues use

how the brain of a child developes

give 3 things that adrenaline does

Any 3 from:
increases heart rate and breathing

stimulates stored gkycogen in the liver to convert to glucose for respiration

stimulates dilation of pupils to let more light in

increases mental awareness

stimulates blood to be diverted away from digestive system and towards limb muscles

definition of homeostasis

the regulation of internal conditions of a cell or organism to maintain optimum conditions for function in response to internal or external changes

what is negative feedback

a mechanism which returns a particular condition to its normal levels if they change

why must temperature be maintained at a constant level? and what will happen if the temperature is too high/low?

so that enzymes perform at their optimum level.
if the temperature is too high they will denature

if the temperature is too low reaction rates will slow down

what will happen if blood glucose levels are too high/low

if the blood glucose is too high, water concentration in the blood would drop which would effect osmosis between cells
if blood glucose levels were too low, there wouldnt be enough glucose for respiration which would lead to low energy levels

fill in the blanks.
The ____ system is composed of ____ which secrete chemicals called ____directly into the ____. the blood carries the ____ to a target ____ where it produces an effect. compared to the ____ system, the effects are ____ but act for _____.

endocrine, glands, hormones, blood, hormone, organ, nervous, slower, longer

where is the pituitary gland found

in the brain

where is the thyroid gland found

in the neck (below the larynx)

where is the adrenal gland found

kidneys

why is the pituitary gland known as the master gland

it secretes hormones which stimulate other glands to secrete different hormones

what is a hormone

a protein produced by glands to give chemical messages that travel through the blood

fill in the blanks
The menstual cycle lasts 28 days. on day 14, an egg is released from the ___. This is called ___ and is controlled by _____. If this ____ is unfertilised then it, along with the thickened lining of the ____ will be shed. This is called ____ and it begins on day 1 of the cycle

ovaries, ovulation, oestrogen, egg, uterus, menstruation

what hormones are produced by the pituitary gland

FSH and LH

What hormones are produced by the ovaries

Oestrogen and Progesterone

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