HSC study Flashcards
where is xylem and phloem located, and special features:
phloem: outside, with sieve and companion cells
xylem: inside of vascular bundle, stiff walls
antigen?
special marker on cells, differentiate between own somatic cells/ foreign pathogens
transgenic def:
inserting gene into new species, 2 different species
sugar and phosphate differentiate:
sugar: bigger connected to bases
phosphate: smaller to sugar
nephron quick process:
filtration, re-absorption, secretion
chromosomal theory of inheritance?
Gregor Mendel
advantages: artificial blood
no cross matching, don’t need fridge,
ectotherm and action when decrease in temp:
eastern brown snake, basks in sun
why does water need to be regulated in cells?
used to regulate solutes, maintain good conc. for metabolic functioning
ADH from where and function:
pituity gland, WATER reabsorbtion, urine conc
aldosterone from where/function:
from adrenal glands, SALT reabsorbtion
infectious disease eg. and host response eg.
common flu, infiltrated body, phagocytes engulf any foreign material and digest
quarantine def:
strategy used to prevent spread/ exposure of disease to healthy organism
vaccination def:
used to prepare organism’s immune system to fight if infected, more efficient
heamoglobin function:
protein used to transport oxygen effectively through the body, one= 4 oxygen
human body part for sound production
larynx in throat
how does vocal chords change sounds
through air passing the throat, causes vocal chords to vibrate, tension changes frequency
accomodation prac:
cardboard= retina
candle= image reflected
lens: concave/biconcave= thickness of human lens
thick: closer candle
thin: move away
action potential process:
need stimulus, trigger response–> flood of sodium from outer (more positive) changing charge, pass down neuron
neuron vs nerve
neuron - single
nerve - bunch of neurons
technology eg:
contact lens:
worn externally, create normal conditions to see
adaptive radiation explain:
one species, mutations allowed to occupy new niche (lower partial oxygen level in mammal), can live in higher altitudes/ survival advantage, pass genes, isolated become new species
human eye wavelength
380- 780mm
hearing freq human:
20-20 000hz
eye receptor and process:
cones (red, green, blue), rods (light/dark)–> receptors in fovea, optic nerve –> brain - back occipital lobe
where does brain process: sight
back, occipital lobe
where does brain process: speech, movement, emotion, problem solving
frontal lobe (front half), also reasoning, planning
where does brain process: perceive auditory stimuli, memory
temporal (middle bottom), ears
where does brain process: movement, recognition, stimuli
pareital lobe (top middle) next to frontal
where does brain process: coordination
cerebellum (extra lump)
where does brain process: unconcious functions (heart)
medulla oblongata (long stem under pons)
where does brain process: left/right brain communication
pons (large lump on stem)
sound receptor:
cochlea
sound process:
sound in air- pinna –> tympanic membrane –> malleus, incus, stapes –> oval window –> cochlear (organ of corti) –> electro chemical to auditory nerve
two models for enzyme/substrate eg
induced: active site changes to fit substrate
lock and key: fixed active site, must be perfect to substrate to bind
homeostasis:
keeping internal functions in regulated state for optimum functioning
negative feedback loop:
stimulus - receptor - control centre - effector - response
endotherm eg. hot/ cold
Red kangeroo:
hot- sweating, vasodilation, licking forearms, conc. urine
cold- insulating fur
ectotherm eg. hot/cold
Blue tongue lizard:
hot- seek shade
cold- bask, flatten body
plants temp regulation:
eucalyptus- drooping leaves, small, sunken stomate
deciduous- lose leaves
blood composition:
plasma, red blood cells, white blood cells
plasma transports:
urea, carbon dioxide
salts, amino acids, lipids, sugars, hormones
WBC and platelets
WBC - larger, less no. (1:600 RBC) has nucleus and fight disease
platelet clot blood
RBC
carry oxygen (oxyheamoglobin), when high conc. of CO2, changes shape of heamoglobin (has iron) –> drops oxygen and picks CO2 to lungs
donut shape, no nucleus
sizes: WBC
11 micrometre