Class 11 Biology - CBSE
Neural Control and Coordination
The chapter 'Neural Control and Coordination' in CBSE Class 11 Biology explores how organ systems integrate and function together through the nervous system. Students learn about the structural and functional unit of the nervous system, the neuron, and the detailed mechanism of nerve impulse generation and conduction. The chapter covers the central nervous system, peripheral nervous system, and the generation of action potential. It also explains the physiology of reflex action, sense organs, and the structure and functioning of the human eye and ear. This chapter is exceptionally high-scoring and vital for understanding human physiology in board and medical entrance exams.
Start Learning FreeKey Concepts
Neuron Structure and Types
A neuron is the structural and functional unit of the neural system, consisting of dendrites, a cell body (soma), and an axon, categorized as unipolar, bipolar, or multipolar.
Generation and Conduction of Nerve Impulse
A resting axon maintains a polarized state via the sodium-potassium pump; a stimulus alters permeability, causing depolarization, action potential generation, and impulse transmission.
Synaptic Transmission
Impulses are transmitted across synapses between neurons either electrically or chemically using neurotransmitters like acetylcholine.
Central Nervous System (CNS)
The CNS comprises the brain (forebrain, midbrain, hindbrain) and the spinal cord, acting as the main information processing and control center.
Reflex Action and Reflex Arc
A reflex action is a fast, involuntary response to a stimulus mediated by the spinal cord, traveling through a pathway called a reflex arc.
Mechanism of Vision and Hearing
Photoreceptors in the retina convert light into neural signals for vision, while the ear processes sound waves through the cochlea for hearing and balance.
Important Formulas
Board Exam Info
In CBSE Class 11 Biology exams, this chapter typically carries around 6-8 marks under the Unit of Human Physiology. Common question types include diagram-based questions (human brain, eye, or neuron structure), differentiation between resting and action potential, steps of synaptic transmission, and short-answer questions on reflex arcs.
Frequently Asked Questions
What is the difference between resting potential and action potential?
Resting potential is the electrical potential difference across the plasma membrane of a resting neuron (around -70 mV) maintained by the sodium-potassium pump. Action potential is the rapid reversal of this potential (up to +30 mV) when the neuron is stimulated.
How does saltatory conduction differ from continuous conduction?
In myelinated axons, nerve impulses jump from one Node of Ranvier to the next, which is called saltatory conduction and is much faster. In unmyelinated axons, the impulse travels as a continuous wave along the membrane.
What is the role of the Eustachian tube?
The Eustachian tube connects the middle ear cavity with the pharynx, and its primary function is to equalize the air pressure on both sides of the eardrum (tympanic membrane).
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