RESPONDING TO THE ENVIRONMENT (Humans) — Grade 12 Life Sciences Notes

Comprehensive CAPS-aligned study notes for RESPONDING TO THE ENVIRONMENT (Humans) in Grade 12 Life Sciences. Browse the sections below to find detailed explanations, worked examples, and exam preparation material.

Sections in RESPONDING TO THE ENVIRONMENT (Humans)

Introduction

Responding to the Environment (Humans) Every second of every day, your body detects and responds to changes in the environment around you and within you. From the bright flash of headlights at night…

Human nervous system

The Human Nervous System The human nervous system is the body's primary communication and control network. It coordinates every action you take, from breathing and digesting food to solving complex…

Central nervous system

The Central Nervous System The central nervous system (CNS) is the command centre of the body. It receives information from all parts of the body via sensory neurons, processes and interprets this…

Peripheral nervous system

The Peripheral Nervous System While the central nervous system acts as the processing centre, it cannot function alone. It needs a network of nerves to carry information to and from the rest of the…

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Autonomic nervous system

The Autonomic Nervous System Your heart beats continuously, your lungs inflate and deflate rhythmically, and your digestive system processes food, all without any conscious effort. The system…

Structure and functioning of a nerve

Structure and Functioning of a Nerve The nervous system relies on specialised cells called neurons to carry electrical impulses at incredible speed, allowing the body to detect stimuli and respond…

The simple reflex arc

The Simple Reflex Arc If you accidentally touch a hot plate, your hand pulls away before you even consciously feel the pain. This rapid, involuntary response is called a reflex action, and the neural…

Disorders of the CNS

Disorders of the Central Nervous System The central nervous system is a highly complex and delicate structure. When it is damaged or diseased, the consequences can be severe and often irreversible,…

Receptors

Receptors Before the nervous system can respond to any change in the environment, that change must first be detected. This is the role of receptors — specialised structures that convert environmental…

Human eye

The Human Eye The eye is the sense organ responsible for sight (vision). It is one of the most complex organs in the body, with multiple structures working together to focus light onto the retina,…

Human ear

The Human Ear The ear is the sense organ responsible for hearing and balance (equilibrium). Sound waves from the environment are collected by the outer ear, amplified by the middle ear, and converted…