Unit 3- Sensitivity
The 5 Senses-Los 5 sentidos
Sense Organs-Órganos de los sentidos
Nervous System-Sistema Nervioso
Nervous Tissue-Tejido Nervioso
Central Nervous System-Sistema Nervioso Central
Peripheral Nervous System- Sistema Nervioso Periférico
Brain Stem-Bulbo Raquídeo
Spinal Cord-Médula Espinal
Sensory Nerves-Nervios Sensitivos
Motor Nerves-Nervios Motores
Voluntary Movement-Movimiento Voluntario
Reflex Movement-Movimiento Reflejo
Through sensitivity we respond to changes in our environment.
Humans interact with the world through senses. First the sense organs capture information from the environment outside the body. Second, the brain interprets the information to make it useful. Third the brain sends out the information to the body and the body acts it out.
The sense organs have special cells called receptor cells that can detect light, pressure and sound. Receptor cells send information to the brain through the nerves.
The nervous system is formed by the Central Nervous System and the Peripheral Nervous System. The Central Nervous System is formed by the Brain and the Spinal Cord. The Peripheral Nervous System is formed by Nerves. Nervous Tissue is found in every part of the body and made up of one type of cell called Neurons that can send and receive messages.
The Brain is the control center of the body and the most important organ. It has three parts:
-Cerebrum controls our voluntary actions and our emotions, and stores memory.
-Cerebellum co-ordinates movement and balance in our body
-Brain Stem regulates the organ activity.
The Peripheral Nervous System formed by the nerves outside of the brain and spinal cord. It serves to connect the Central Nervous System to the limbs and organs. The sensory nerves carry information from the sense organs to the central nervous system. Motor nerves carry orders from the central nervous system to the muscles and organs.
Voluntary movements are those that we choose to do, like writing. Reflex movements happen automatically without a conscious order from the brain.