Nerves and Hormones Flashcards
define the term synapse
junction between nerve cells/ a structure that permits a neurone to pass an electrical or chemical signal to another cell by diffusion
define the term homeostasis
how the body keeps things the same/stationary
how is temperature, blood sugar and water controlled in the body?
temperature- sweat and go red
blood sugar- insulin
water- urine
how is FSH involved in the menstrual cycle?
FSH hormone starts the menstrual cycle, released from pituitary glands
what’s oestrogen’s role in the menstrual cycle?
thickens uterus lining, stops FSH and starts LH
how is LH involved in the menstrual cycle?
caused ovulation
the use of hormones in oral contraceptives?
oestrogen to stop FSH, which stops production of eggs
the use of hormones in fertility treatments eg. IVF
FSH to stimulate eggs
LH to get ovulation
capture eggs
the use of hormones in agriculture and horticulture?
auxins used to help plants grow and to kill weeds. Used when taking cuttings
the role of auxins in phototropism in the shoot…
shoots grow positively towards the light
the role of auxins in geotropism in the roots
plants respond to gravity, and grow positively down towards gravity
what are the 5 sense organs and what stimulus do they each detect?
SKIN- touch, pressure, temperatures, pain TONGUE- chemicals in food NOSE- chemicals in air EYES- lights EARS-sound and position of head
what is a reflex action?
When the safety of an organism demands a very quick response, the signals may be passed directly from a sensory neuron, via a relay neurone, to a motor neurone for instant, unthinking action. This is a reflex action.
what is a reflex arc
reflex arc is the nerve pathway which makes a fast automatic response possible
what is the pituitary gland?
The pituitary is an important gland in the body and it is often referred to as the ‘master gland’, because it controls several of the other hormone glands (e.g. adrenals, thyroid).
