coordination and response

reflex arc path: doesnt involve thinking. Automatic response

stimulus:change in environment

receptor: skin/light receptors in retina

sensory n: sense organs -> cns(palitos-axon-cell body-dendrite)

relay n: solo un cell body

motor n: cell body - axon (con myelin sheath, transmission of impulse + effective)

effector: muscles/glands

response: action in response to the stimulus

synapse:

pre synaptic neurone

axon --> nerve impulse - vesicles containing NT -> synaptic cleff-> NT receptors --> nerve impulse a la dendrite de la post synaptic neuron

heroin (morphin) binds to the receptor so they cant receive NT as they are occupied by heroin and thus no pain is felt -> euphoria -> abstinence

nerve impulse= wave of depolarization

0- threshold of excitation. 1-Na+ channels opens and Na enters the cell

2- K+ channels open and K leaves the cell. 3-Na+ stops entering TOPE

4- K+ leaves cell. 5- channel closes

Nervous/Endocrin

Faster/Slower

NTs/Hormones

Nerve Impulse/ By Blood

Local effect/abroad

tip removed: wont grow, place where auxin is produced is removed

tip covered: lots of auxin made - grows very tall

normal: se bendea al sol porque lado oscuro mas auxin

coso que gira: para arriba

rods en la retina, detects grises

cones en la fovea, detects colors

pupil reflex:

far away objects: ciliary muscles relax giving them a larger diameter-> pulls on suspensory ligaments-> pulls on lens-> makes lense thinner (less convex) For close objects es lo opuesto