Posts

Chapter 10 - Human Eye and The Colourful World

 Home Page Chapter 10: The Human Eye and the Colourful World 1. The Human Eye The human eye is a natural optical device that helps us to see objects around us.   Draw Human Eye from figure 11.1 Ncert Book Structure of Human Eye: Eye Ball : Its spherical in shape with diameter 2.3 cm. Cornea: Transparent front part where light enters. It bends light towards the lens. Aqueous Humour: A transparent liquid filled in the space between cornea and eye lens. Iris: It is the dark muscular diaphragm between the cornea and the lens. Pupil: It is the small hole between the iris through which light enters. Lens: Convex, transparent, flexible structure located behind the iris. Ciliary Muscles: Muscles holding the lens in position. Vitreous Humour : A liquid filled in the space between the eye lens and retina. Retina: Screen where the image is formed. It contains light-sensitive cells (rods and cones)...
Post a Comment
Read more

Chapter 6 - Control and Coordination

 Home Page   Chapter: Control and Coordination 1. Nervous System The nervous system is responsible for controlling and coordinating various activities of the body. It helps the body to respond to external and internal stimuli quickly by transmitting electrical impulses. ➤ Parts of the Nervous System: Central Nervous System (CNS) Brain Spinal cord Peripheral Nervous System (PNS) Nerves arising from the brain and spinal cord. Connects CNS to the rest of the body.    2. Neuron – Structure & Diagram A neuron is the structural and functional unit of the nervous system. It is a nerve cell that transmits messages in the form of electrical signals. Structure of a Neuron: Dendrites – Receive messages. Cell body (Cyton) – Contains nucleus. Axon – Long extension that carries impulses away. Axon terminals – Pass the message to the next neuron or muscle. Draw Labelled Diagram of a Neuron...
Post a Comment
Read more