Biology Chapter: Ear, Eye, Skin Structure

Human Hearing

• The cochlea is the primary structure responsible for hearing in humans.
• It converts sound waves into neural signals, which are sent to the brain for interpretation.

Skin Function

• The primary function of the skin is to act as a barrier, protecting internal organs from environmental hazards.
• It regulates temperature and water loss while also providing sensory information through receptors.

Lifeless Classification

• In biology, non-living entities such as minerals, water, and gases are classified as lifeless.
• These do not exhibit characteristics of life, such as growth, reproduction, or metabolism.

Eye Functionality

• The lens is the part of the eye responsible for focusing light onto the retina.
• It adjusts its shape to help in precise aiming of light rays for clearer vision.

Dead Organisms

• Dead organisms lack biological functions such as respiration, growth, and reproduction.
• They do not respond to external stimuli and can undergo decomposition processes.