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The document discusses the five basic human senses: sight, sound, touch, smell, and taste. It provides details on the sensory organs and processes associated with each sense. For sight, it describes how light enters the eye and is focused on the retina, sending signals to the brain. For sound, it explains how sound waves are captured by the ear and transformed into signals through the middle ear bones and inner ear. The sense of smell starts with receptors in the nose capturing chemicals, while taste occurs when chemicals stimulate taste bud cells in the tongue. Touch is sensed through specialized receptors in the skin that detect pressure, vibration, and other sensations.The senses (2)
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ºÝºÝߣ describe the role of ABA in plant abiotic stress mitigation. ºÝºÝߣ include role of ABA in cold stress, drought stress and salt stress mitigation along with role of ABA in stomatal regulation. Coordination and Response: The Nervous System | IGCSE Biology
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This comprehensive IGCSE Biology presentation explains the nervous system, focusing on how the body coordinates and responds to stimuli. Learn about the central and peripheral nervous systems, reflex actions, neurons, synapses, and the role of neurotransmitters. Understand the differences between voluntary and involuntary responses and how the nervous system interacts with other body systems. Ideal for Cambridge IGCSE students preparing for exams!
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Sense_Organs_Detailed by miss madhavi sen
- 1. Sense Organs in Detail The human body has five major sense organs: the eyes, ears, nose, tongue, and skin. These organs are responsible for detecting external stimuli and sending signals to the brain for interpretation. Each sense organ is specialized to respond to specific types of stimuli, allowing us to perceive the world around us. 1. Eyes The eyes are the organs responsible for vision. They detect light and convert it into electrical signals, which are processed by the brain to form images. The main parts of the eye include: - Cornea: The transparent front part that covers the eye. - Iris: The colored part of the eye that controls the size of the pupil. - Pupil: The opening in the center of the iris that regulates the amount of light entering the eye. - Retina: The inner layer of the eye that contains photoreceptor cells (rods and cones). - Optic Nerve: The nerve that transmits visual information from the retina to the brain. 2. Ears The ears are responsible for hearing and maintaining balance. Sound waves are captured by the outer ear, travel through the ear canal, and vibrate the eardrum. The ear consists of three main parts: - Outer Ear: Includes the pinna and ear canal. - Middle Ear: Contains the eardrum and three small bones (ossicles) that amplify sound. - Inner Ear: Contains the cochlea, which converts sound vibrations into electrical signals for the brain. 3. Nose The nose is the organ of smell (olfaction). It detects airborne chemicals, which are interpreted as
- 2. different smells. The main parts of the nose involved in smelling include: - Nasal Cavity: The space inside the nose that filters, warms, and moistens air. - Olfactory Receptors: Located in the upper nasal cavity, these receptors detect odor molecules and send signals to the brain. 4. Tongue The tongue is responsible for taste. It contains taste buds that detect different flavors: sweet, salty, sour, bitter, and umami. Taste buds are located on the papillae, which are small bumps on the surface of the tongue. 5. Skin The skin is the largest sense organ and is responsible for the sense of touch. It detects temperature, pressure, and pain through sensory receptors. The skin is composed of three main layers: - Epidermis: The outer layer that protects the body. - Dermis: The middle layer that contains nerves, blood vessels, and sweat glands. - Hypodermis: The innermost layer that provides insulation and cushioning.