Year 2 spec topic 6 - Organisms respond to changes in their internal and external environments

Question 1

3.6.1.1

Answer 1

Organisms increase their chance of survival by responding to
changes in their environment
Taxes + kinesis
Plant hormones- IAA
Reflex arc

Question 2

3.6.1.2

Answer 2

Receptors
ONLY RESPOND TO SPECIFIC STIMULI
-Pacinian corpuscle in skin - generator potential
-Rods and cones in eye retina - visual acuity, colour vision, light sensitivity

Question 3

3.6.1.3

Answer 3

Electrical control of heart rate by autonomic nervous system
Medulla

Question 4

3.6.2.1

Answer 4

Structure of a neurone
Resting potential
Action potential - all or nothing principle
Refractory period

Question 5

3.6.2.2

Answer 5

Synapses between neurones/ neuromuscular junction - structure
Acetyl choline