Co Ordination

Question 1

Caphalopod

Answer 1

Organisms with a brain unlike jellyfish

Question 2

Stimulus

Answer 2

A detectable alteration in the internal or external environment an organism that produces some change in the organism

Question 3

Receptor

Answer 3

Cells or organs that can detect change in internal or external environment.they convert energy from stimulus into some form of energy that can be processed by the organism

Question 4

Transducer

Answer 4

Organisms covert energy, the process is known as transduction

Question 5

Co ordinator

Answer 5

This connects information from the receptor to the appropriate effector

Question 6

Effector

Answer 6

An organ that responds to stimulation by a nerve impulse resulting in a change or response

Question 7

Response

Answer 7

The action that an organism takes to a stimulus

Question 8

Taxis

Answer 8

Is a simple response whose direction is determined but the direction of the stimulus

Question 9

Positive direction

Answer 9

Moving towards something e.g food

Question 10

Negative taxis

Answer 10

Moving away from something e.g a hot source

Question 11

Kinesis

Answer 11

Is a form of response in which the organism does not move towards or away from a stimulus . Instead the more unpleasant the stimulus the more rapidly it moves and more rapidly it changes direction

Question 12

Reflex

Answer 12

A rapid transport to a stimulus without conscious control

Question 13

The reflex arc

Answer 13

Stimulus, receptor, sensory, relay, motor, effector, response

Question 14

Advantages to the reflex

Answer 14

Helps organisms avoid damage, it’s very fast you don’t need to think about it, doesn’t need to be learnt-protects infants

Question 15

Pacinian corpuscle

Answer 15

Receptor the detects pressure, touch and vibrations in the skin

Question 16

Describe the pacinian corpuscle when it is stimulated

Answer 16

Pressure cause the lamellae to stretch and deform, stretch mediated sodium ions open, Na+, depolarisation of the neurone is called greater potential, if threshold is reached then and action potential is inhibited

Question 17

Histamine

Answer 17

Triggers vasodilation and increases vascular permeability.stored in granules of circulating white blood cells

Question 18

Prostaglandin

Answer 18

Hormone like substance that have a variety of strong physiological effects such as regulating the contraction and relaxation of smooth muscle tissue

Question 19

Tropisms

Answer 19

In plants- growth movement of a plant in response to a directional stimulus. The plant will either grow towards or away from the stimulus

Question 20

Auxins

Answer 20

Hormones released to grow, compounds are generally considered auxins if they induce cell elongation in stem

Question 21

Geotropism

Answer 21

Roots are positively geotropic stems are negatively geotrpic