Test: Nervous System - Class 7 MCQ

Hormones play a vital role in chemical coordination by acting as chemical messengers that regulate various bodily functions, such as metabolism, growth, and response to stress. They ensure that the body maintains homeostasis and responds appropriately to changes in the environment.

Sensory neurons are responsible for carrying impulses from sense organs to the central nervous system (CNS). This pathway is crucial for processing sensory information, enabling the brain to respond appropriately to stimuli, such as light, sound, and touch.

The peripheral nervous system (PNS) includes cranial and spinal nerves. It connects the CNS to all parts of the body and facilitates communication between the brain, spinal cord, and peripheral organs.

The sympathetic nervous system triggers the "fight or flight" response during stressful situations, preparing the body for immediate action. This involves increasing heart rate, redirecting blood flow to muscles, and releasing energy reserves to respond to perceived threats.

The somatic nervous system is responsible for voluntary movements, transmitting sensory information to the CNS and relaying commands from the CNS to skeletal muscles. This system enables conscious control over body movements.

In response to a threat, the body releases hormones that provide the energy and strength needed to react swiftly, often referred to as the "fight or flight" response. This is a crucial survival mechanism that prepares the body to handle emergencies.

A mixed nerve contains both sensory and motor neurons. This allows it to carry impulses both to and from the central nervous system, facilitating comprehensive communication and coordination within the body.

The function of the axon in a neuron is to transmit messages away from the neuron to other neurons, muscles, or glands. This long extension is crucial for the communication of signals throughout the nervous system, facilitating the coordination of bodily functions and responses.

The protective sheath that surrounds a nerve is called the medullary sheath. It serves to insulate the nerve fibers, preventing the mixing of impulses and ensuring efficient signal transmission.

The primary function of the cerebellum is to manage body balance and coordination. It ensures that movements are smooth and precise, which is essential for physical activities that require fine motor skills.

The two primary types of coordination in living organisms are nervous coordination and chemical coordination. Nervous coordination is managed by the nervous system, allowing for rapid responses to stimuli, while chemical coordination involves hormones that regulate bodily functions. This dual system ensures that organisms can respond efficiently to both internal and external changes.

Terminal branches of the axon connect to the dendrites of another neuron at a synapse. This connection is crucial for the transmission of messages between neurons, facilitating communication throughout the nervous system.

The cerebellum is responsible for managing balance and muscle coordination. It plays a crucial role in ensuring smooth and coordinated movements. Interestingly, alcohol consumption can impair cerebellum function, leading to poor motor coordination.

Controlling voluntary muscle movements is NOT a function of the autonomic nervous system; this function is managed by the somatic nervous system. The autonomic nervous system regulates involuntary functions such as heart rate, blood pressure, and digestion.

The medulla oblongata connects to the spinal cord and controls essential involuntary functions such as heartbeat and breathing. It serves as a crucial communication pathway between the brain and the body.

The medulla oblongata regulates involuntary actions such as heartbeat, breathing, swallowing, and digestion. This part of the brain is vital for survival, as it controls essential life functions that occur without conscious thought.

Association neurons, located in the spinal cord, connect sensory and motor neurons. They play a critical role in processing information and coordinating responses, making them essential for reflex actions and complex behaviors.

Coordination refers to the synchronization of various bodily processes to maintain both internal and external balance. This ensures that different systems work together efficiently to meet the organism's needs, such as responding to stimuli or maintaining homeostasis.

The spinal cord's main function is to transmit messages between the brain and the body. It controls reflexes and carries sensory and motor information, playing a critical role in the nervous system's overall function.

The cerebrum is involved in higher cognitive functions like intelligence, consciousness, memory, and voluntary activities. It is the largest part of the brain and is crucial for complex thought processes and decision-making.