Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
29 Cards in this Set
- Front
- Back
|
What does the nervous system allow humans to do? |
React to their surroundings and coordinate their behaviour |
|
|
|
Detect stimuli (changes in the environment) |
|
|
|
Eyes detect Light Ears detect Sound/Changes in position (keeping us balanced) Tounge/Nose detects Chemicals (for taste and smell) Skin detects Touch/Pressure/Pain/Temperature change |
|
|
|
Nucleus Cytoplasm Cell Membrane |
|
|
|
Receptors detect a stimulus Impulse (message) sent along Sensory neurone Chemical transmitter is released from sensory neurone Crosses synapse (gap) and reaches relay neurone in the Central Nervous System (CNS) Impulse travels along Relay Neurone Chemical transmitter is released from relay and crosses synapse to motor neurone Impulse travels along Motor neurone. Impulse reaches Effector - The effector is either a gland or a muscle This produces the response.(e.g. muscle contracts) |
|
|
|
Junction between two neurones Chemicals are released into the gap between the two |
|
|
|
Chemical substances that control processes in the body |
|
|
|
In the bloodstream |
|
|
menstrual cycle which takes 28 days and where they are released from. |
FSH released by pituitary gland LH released by pituitary gland Oestrogen released by ovaries |
|
|
|
Stimulates egg to mature in Ovaries Stimulates ovaries to produce Oestrogen |
|
|
|
Causes egg to be released from ovary (ovulation) |
|
|
What is the function of oestrogen? |
High levels Inhibit production of FSH Stimulates production of LH Causes womb lining to build up |
|
|
|
FSH is used in IVF treatment. It stimulates woman’s ovaries to produce lots of eggs (mature them) Oestrogen is used in Contraceptive pill. It inhibits FSH production thus preventing eggs maturing |
|
|
progesterone-only pills? |
Fewer side effects |
|
|
|
Woman given FSH to mature her eggs Eggs removed – placed into petri dish/test tube Fertilised with man’s sperm Fertilised eggs develop into embryos Embryos placed back into woman’s uterus |
|
|
|
Multiple births can be associated with higher health risks to mother or foetus |
|
|
|
Keeping our bodies’ internal environment constant. |
|
|
|
Water - Skin (sweat) Kidneys (urine) Ion content - Skin (sweat) Kidneys (urine) Temperature - Skin (sweating) Blood Sugar Level – Pancreas |
|
|
|
Lungs- Breathing out water vapour Skin- Sweating to keep cool Urine- Excess water leaves the kidneys |
|
|
levels? |
To provide cells with a constant supply of energy |
|
|
temperature at 37 degrees? |
Too hot and ENZYMES which control reactions do not work |
|
|
|
|
|
|
|
|
|
|
How do roots grow? |
Towards moisture In the direction of the force of gravity |
|
|
|
Auxin |
|
|
|
In shoots auxin stimulates growth. In roots auxin slows growth. |
|
|
|
Movement in response to light |
|
|
|
|
|
|
|
Weed killer Root cuttings Cause fruit to ripen |
