GCSE Additional Science P5 P6 B6

B6 - Brain and mind

Central nervous system (CNS) – Coordinates the body’s reaction.

Sensory neuron – carries electrical nerve impulse to the CNS.

Receptor – cells that detect the stimulus.

Stimulus – change in the environment.

Effector – Cells that carry out the response (muscular glands).

Response – how the body reacts to the stimulus.

 Motor neuron – carries electrical nerve impulse from the CNS.

Neurons in your brain are connected together to form complicated pathways.

 Ecstasy is the common name for the drug MDMA.  

Ecstasy binds to the receptor where serotonin should bind.

The Central Nervous System (CNS) is the brain.

 The gap in between a neuron is called a synapse.

P5 - Electric Curcuits

 If you increase the voltage – then more current will flow…

… If you increase the resistance – then less current will flow.

Electric current is a flow of charge round a circuit. Its units are amperes, A.

 In an electrical circuit the components and wires are full of charges that can move.

Current will only flow through a component it there’s a voltage across that component.

Voltage is the driving force that pushes the current round. Its units are Volts, V.

Resistance is anything in the circuit which slows the flow down. Its units are ohms, Ω.

A voltmeter measures potential difference between two points.

Units of charge are AMPS.

In an Insulator line plastic electrons fixed and charge…