Exercise 15 Review Sheet Histology of Nervous Tissue Name Lab Time/Date 1. The basic functional unit of the basic functional unit of the nervous s
The Correct Answer and Explanation is :
he basic functional unit of the nervous system is the neuron.eurons are specialized cells responsible for transmitting information throughout the body in the form of electrical and chemical signals.his transmission enables various functions, including sensory perception, motor coordination, and cognitive processes.
tructurally, a typical neuron comprises three main parts:
- Cell Body (Soma): his central part contains the nucleus and is responsible for maintaining the neuron’s metabolic activities.
- Dendrites: hese are branching extensions that receive incoming signals from other neurons or sensory receptors.
- Axon: long, slender projection that transmits electrical impulses away from the cell body to other neurons, muscles, or glands.
eurons communicate through a process called synaptic transmission.hen an electrical impulse, known as an action potential, travels down the axon to the axon terminals, it triggers the release of neurotransmitters.hese chemical messengers cross the synaptic cleft—the gap between neurons—and bind to receptors on the dendrites of the adjacent neuron, propagating the signal.
he human nervous system contains an estimated 86 billion neurons, each forming numerous connections, resulting in a complex network that underlies all neural activities.eurons are classified based on their function:
- Sensory (Afferent) Neurons: ransmit sensory information from receptors to the central nervous system (CNS).
- Motor (Efferent) Neurons: onvey commands from the CNS to effectors like muscles and glands.
- Interneurons: ct as intermediaries between sensory and motor neurons within the CNS, playing a crucial role in reflexes and higher functions like learning and decision-making.
upporting neurons are glial cells, which provide structural support, nutrition, insulation, and protection.n the central nervous system, key glial cells include astrocytes, oligodendrocytes, microglia, and ependymal cells.n the peripheral nervous system, Schwann cells and satellite cells perform similar supportive roles.
nderstanding the structure and function of neurons is fundamental in fields like neuroscience and medicine, as it provides insights into how the nervous system operates in health and disease.