This document discusses the human interaction systems. It describes the main parts as the sense organs that detect stimuli and send nerve impulses to the nervous system, which interprets them as sensations. The nervous system has two parts, the central nervous system consisting of the brain and spinal cord, and the peripheral nervous system consisting of nerves. The central nervous system sends orders through nerves to effectors, which realize responses like movement. The locomotor system, consisting of muscles, tendons, bones and joints, allows us to move thanks to our skeleton.

1. SCIENCE
UNIT 5
HUMAN BEINGS:
INTERACTION

2. • The sense organs
The sense organs detect and transform stimuli
into nerve impulses. The nerve impulses are
sent to the nervous system which interprets
them as sensations: colours and shapes, sounds,
smells, flavours, heat and cold, etc.

3. • The nervous system
Our nervous system has two parts.
• The central nervous system (formed of the
brain and spinal cord)
• The peripheral nervous system (formed of
nerves).

4. The central nervous system The peripheral nervous system

5. • The effectors
The orders that leave the central nervous system
travel through the nerves to the effectors.
The effectors realice the responses like
producing substances or movements.

6. • The locomotor system
• The locomotor system is formed by the
muscles and tendons of the musculature and
the bones and joints of the skeleton. Thanks
to our locomotor system we can move.

7. • The sense organs
The eye The ear
The skin The pituitary and taste buds

8. Lesson vocabulary
To detect: detectar
To transform: transformar
Stimuli: estímulo
To send : enviar
Shapes: formas
Flavours: sabores
Brain: cerebro
Spinal cord: espina dorsal
Nerves: nervios
Order: orden
To realize: realizar
Responses: respuestas
Muscles: músculos
Tendons: tendones
Bones: huesos
Joints: articulaciones
To can: poder
To move: mover