Coordination and Response

Question 1

Electrical impulses travel….

Answer 1

along neurones

Question 2

define Central Nervous system

Answer 2

The central nervous system consists of the brain and spinal cord

Question 2

define Peripheral nervous syystem

Answer 2

the peripheral system nervous system consists on nerves outside the brain and spinal cord

Question 3

Role of nervous

Answer 3

the role of the nervous system is in the regulation and coordination of body function

Question 4

state Simple reflex arc

Answer 4

receptor, sensory neurone, relay neurone, motor neuron and effector

Question 5

define Simple reflex action

Answer 5

A simple reflex action is a means of automatically and rapidly intergrating and coordinating stimuli for the response of effectors

Question 6

roles synapse

Answer 6

is a junction between neurones
it ensure impulses travel in one direction

Question 7

Events at a synapse

Answer 7

an impulse stimulates the release of neurotransmitter molecules from the vesicles into the synaptic gap and the diffuse across the gap and bind on to the protein receptors on the next neurone and an impulse is stimulated on the next neurone

Question 8

define Sense organs

Answer 8

sense organs are a group of receptors cells that respond to specific stimuli being light, tempereture, sound, touch and chemicals

Question 9

Function of cornea

Answer 9

refracts light

Question 10

Function of iris

Answer 10

controls how much light enters the pupil

Question 11

Function of lens

Answer 11

focuses light onto retina

Question 12

What happens during a Pupil reflex

Answer 12

in dim light the cirular muscles relax and the radial muscles contracts and the pupils widens increases in diametre to allow more light to enter when in bright light the circular muscles contract and the radial muscles relax and this causes the pupil to contract and to shrink in diametre to allow less light in

Question 13

what happens in Accomadation

Answer 13

when an object is far the ciliary muscles contract and the pressure cause the suspensory ligaments to tighten and this causes the lens to become thinner and lesss light is bent. When an object is close the ciliary muscles relax and the lack of pressure causes the the suspensory ligament to slacken and this inturn causes the lens to become fatter or thicker and more light is bent

Question 14

Rods are…

Answer 14

for night vision

Question 15

what is fovea

Answer 15

the fovea is an area on the retina where almost all of the cone cells are found

Question 16

what is hormone

Answer 16

is a chemical substance produced by glands that is carried in the blood that alters the activity of one or more target organs

Question 17

what happens when u have Adrenaline

Answer 17

fast heart rate
higher glucose concentration
fast breathing rate increased pupil diametre

Question 18

compare nervous system to hormonal

Answer 18

nervous system is faster
hormonal lasts longer
impulses carried in neurones where as hormones carried in blood

Question 19

Define homeostasis

Answer 19

this is the maintenance of a constant internal enviroment

Question 20

describe how glucose levels are controled

Answer 20

when glucose levels are high this change is detected and the hormone inslulin is excreted by pancreas and it stimulates the liver to convert excess glucose in the blood to gylcogen whic is to be stored when glucose levels are low the change is detected and glucagon is released to stimulate the liver to convert stored glucose glycogen in glucose to be released into the blood

Question 21

treatment for type 1 diabeties

Answer 21

insulin shot
execise to regulate glucose

Question 22

when you are hot what happens?

Answer 22

sweat is secretd by sweat glands
hairs lie flat on the skin allowing air to freely circulate as more heat will be lost to enviroment
vasodilation more blood pumped into arterioles

Question 23

when u have low tempereture whats happens

Answer 23

we shiver
the hairs on our skin trap a layer of air which acts as insulatores
vasoconstriction

Question 24

Define gravitropism

Answer 24

this is a response resulting in parts of a plant growing away or towards from gravity

Question 25

Define phototropism

Answer 25

this is a respone resulting in parts of a plant froing towards or away from the direction of light

Question 26

how does auxin work?

Answer 26

auxin is stimulated on root tip
it diffuses along the plant
it is unevenly distributed in response to gravity or light
auxin causes elongation