Monday, August 16, 2004
this is awful. im up to mug on bio. it's that time of the year again. urgh. jessica and i am feeling real low. shall tell you more later on... a swim later with pts, or just mugging on geog and amath. hmmmm okok back on biology...
Near objects
ciliary muscles contract
tension in suspensory ligament reduces
lens become more convex
pupil size reduced
Far objects
ciliary muscles relax
tension in suspensory ligament increases
lens become more concave
pupil size increased
low light bright light
pupil dilate constrict
ciliary muscles relax contract
radial muscles contract relax
amt of light entering eye increased decreased
knee jerk
-impulese produced travel along the sensory neurones to the spinal cord
-in the spinal cord, the impulses travel to the relay neurone
-in the relay neurone, the impulses travel along the effector neurone to the effector
-upper thigh contracts, causing the knee to jerk.
cerebrum-70% of the brain, controls all voluntary actions, responsible for speech, intelligence, reasoning and usage of information
cerebellum-controls and co-ordinates musclar action
medulla oblongata-controls all involuntary actions
hypothalamus-controls heart rate, blood pressure, feelings, contains thermal receptors and osmoreceptors.
adrenaline
liver-converts glycogen to glucose, increases energy in the body
lung-increases rate of gaseous exchange and heart beat,increases oxygen concentration in the blood
heart-increases blood pressure and heart rate, increases blood flow to muscles
sweat glands-increase sweating,
hair-erector muscles contract.. leading to goose pimples
skin-arterioles contract, carries more blood
during rigorous muscular activity
-during streneous activity, breathing alone is not enough to provide sufficient oxygen for respiration
-muscle experiences a shortage of oxygen, causing formation of lactic acid
-accumulation of lactic acid may lead to muscular cramps or fatigue
-muscle experiences oxygen debt during periods of anaerobic respiration
-rapid breathing helps to repay the oxygen debt by increasing oxygen in the muscles. convert lactic acid to glucose.
hard to believe actually many nocturnal creatures are still up at this hour. wenjie's one of them. how sweet of him to accompany me eh? haha thanks!
ashthongs sucks. he kept pestering me about my pimple.
he's gonna get a kick from me.
pts teach me taekwondo leh. i need to kick.
wokay byebye!
scribbled by that paralysed eskimo* at
4:16 AM
4:16 AM
