Human Body – Ears
We only hear the sound or sound with our ears, but they also help us in maintaining the balance of our body. Depending on the design, the ear can be divided into three parts – Outer ear, Middle ear and Inner ear.
When an object produces a sound, sound waves are produced, these waves reach the inside of the ear through a tube passing through the outer ear. The middle ear tympanic membrane (Eardrum) or tympanic membrane starts vibrating by hitting these waves. There are three small bones (ossicles) just behind the esophagus. These are called the malus or hammer incus or anvil and the stapes or stirrup.
These bones carry these cups to the cochlea. The cochlea is filled with a fluid, inside which there are nerve endings. Due to having a cup in the cochlea, this liquid substance also starts to cup. These vibrations stimulate the ends of the nerves and the sensations generated by the stimulation reach the brain through the auditory nerve. The brain analyzes the voice and we are heard. Our ears are able to hear all sounds, loud and dim. Periodically cleaning your ears is necessary.
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Human Body- Eye
Eyes or eyes are such important parts of our body, from which we see the environment around us. Our eye is circular in shape, about 2.5 cm in diameter. it happens. These muscles can move around with the help of these muscles. The function of the eye is similar to that of a photography camera. The rays from the object we see fall through the cornea and aqueous humor through the pupil (Pupil) on the lens.
Retina focuses it, where a small and inverted image of the object is formed. Sensory cells of the cortex are stimulated by this reflection. Stimulus produced by it reaches the brain through the fibers of optic nerve. The brain makes it straight and the object starts to appear to us in real form. The sensory cells of the retina of the eye are called rods and cones. The sticks are sensitive to slow light, while the cones give us the feel of colors. The number of sensory cells is approximately 130 million.
Core of the eye
- Lachryma or tear gland: It produces tears, which keeps the eye clean.
- Iris: The pupil becomes smaller or larger due to its spread and contraction.
- Suspensory ligaments: A fine capsule is placed on the lens, which is connected to the ciliary body by a very soft muscle.
- Lens: It is soft and translucent. This makes a reflection of the object in the end.
- Vitreous humor: Transparent fluid like jelly.
- Aqueous humor: It is a water-like fluid.
- Cornea: Clean and extremely transparent part of the eyeball.
- Choroid Layer: Extremely soft black color, which prevents light from spreading in the eye.
- Retina: The light-sensitive curtain, where the image of the object is formed.
- Optic nerve: It works by taking the reflection to the brain.
Nature has created two eyes in our body. With two eyes, we get an accurate sense of distance and get complete knowledge of the solidity and depth of objects.
Human Body – Ears and Eyes | Human Body – Ears and Eyes