Test: The Nervous System - Class 10 MCQ

The forebrain is responsible for higher cognitive functions, including intelligence, memory, consciousness, and voluntary actions, playing a crucial role in complex behaviors and decision-making.

A synapse is the junction where the terminal branches of an axon from one neuron connect with the dendrites of another neuron. This connection is crucial for transmitting nerve impulses through neurotransmitters.

The primary function of the nervous system is to keep us informed about the outside world through sensory organs. This allows organisms to respond to environmental changes, ensuring survival and adaptation.

The myelin sheath insulates the axon and speeds up the transmission of nerve impulses. It allows electrical signals to travel more quickly along the nerve fiber, improving communication within the nervous system.

The ear detects two types of equilibrium: dynamic equilibrium, which relates to motion, and static equilibrium, which relates to the position of the body. Sensory cells in the semicircular canals and otolith organs facilitate this detection.

Humans have 12 pairs of cranial nerves that emerge directly from the brain and brainstem, responsible for various sensory and motor functions, including smell, vision, and facial movements.

Sensory neurons are responsible for transmitting impulses from sensory receptors, such as those in the skin and organs, to the central nervous system (CNS), allowing for the perception of stimuli.

The three main parts of a neuron are the cell body, dendrites, and axon. The cell body contains the nucleus, dendrites receive signals, and the axon transmits impulses away from the cell body to other neurons or muscles.

The cochlea is located in the inner ear and is responsible for converting sound vibrations into nerve impulses, which are then transmitted to the brain for processing.

Natural reflexes, also known as inborn reflexes, are present at birth and do not require previous experience or learning. Examples include salivation and withdrawal reflexes.

Sensory cells in the utriculus and sacculus detect static equilibrium, which helps the body understand its position relative to gravity and maintain balance.

Mixed nerves carry both sensory and motor fibers, allowing them to transmit sensory information to the central nervous system and relay motor commands to the muscles, facilitating coordinated actions.

Hyperopia, or farsightedness, is an eye defect that makes it difficult to see nearby objects clearly due to the shape of the eye or lens. It can often be corrected with convex lenses.

The autonomic nervous system regulates involuntary bodily functions such as heart rate, digestion, and respiratory rate, operating without conscious control to maintain homeostasis.

The lens is a transparent, biconvex structure that focuses light onto the retina. It changes shape to accommodate for near and distant vision, allowing for clear visual perception.

Rods are specialized sensory cells in the retina that are sensitive to dim light but do not detect color. They play an essential role in night vision and peripheral vision.

Conditioned reflexes develop through experiences and learning. They differ from natural reflexes, as they are shaped by the individual's interactions with their environment, such as salivating at the smell of food.

Accommodation refers to the process by which the lens of the eye changes shape to focus on objects at varying distances. The lens flattens for distant vision and becomes rounder for near vision.

The medulla oblongata regulates vital functions of the body, including heartbeat, breathing, and other autonomic activities. It is essential for maintaining life and responding to physiological changes.

The hypothalamus plays a crucial role in regulating essential bodily functions, including body temperature, hunger, thirst, and the activity of the pituitary gland, thus maintaining homeostasis.