Nervous system

• The brain is responsible for allowing reactions to surroundings and the coordination of actions.
• The transmission of information in the brain is via neurons.
• Receptors in the brain detect stimuli.
• The Central Nervous System consists of the brain, spinal cord, and effectors such as muscles and glands.
• Effectors carry out a response.
• A reflex arc is a part of the brain's function.
• The importance of the brain is protection and fast, automatic subconscious processing.
• Sensory neurons, relay neurons, and motor neurons are parts of the brain's function.
• Investigation and treatment of patients with brain damage involve comparing symptoms.
• Difficulties in studying the brain include complexities and delicateness.
• The eye has a structure, temperature regulation, and receptors that detect blood temperature.
• The eye's structure includes the sclera, which is a tough outer layer that protects internal structures, and the cornea, which allows light into the eye to focus on the retina.
• The iris contracts or relaxes to control the amount of light entering the eye.
• The suspensory ligaments and ciliary muscles control the shape of the lens, a process known as accommodation.
• Myopia is a disorder where the lens is too curved, causing light to focus in front of the retina.
• Hyperopia is a disorder where the lens is too flawed, causing light to focus behind the retina.
• Treatment for disorders of the eye can involve contact lenses, glasses, laser eye surgery, or replacement lenses.