Phases of action potential & role of gated ion channels
rubabStages / Phases of Action Potential: 1. All cells have a membrane potential; however, only certain kinds of cells, including neurons and muscle cells, have the ability to generate changes…
What do you mean by resting membrane potential? How is a resting membrane maintained?
Resting membrane potential can be defined as the potential difference that results from the separation of charges along the plasma membrane of a neuron or other excitable cell. A resting…
What is a membrane potential? What causes it in a neuron?
All living cells have an electrical charge difference across their plasma membranes due to ionic imbalances, the inside of the cell being more negative than outside. This difference in charge…
Types of neurons , structure & Functions
A neuron is a specialized cell with a cell body containing nucleus, and extending from cell body two types of cytoplasmic processes: one or more dendrites, and a single axon.…
Answers to Questions of Nervous and Sensory System
Q 1. Define the following terms: (a) Neuron, (b) axon, (c) dendrite, (d) myelin sheath, (e) afferent neuron, (f) efferent neuron, (g) interneuron or associative neuron, (h) neurolemocyte, (i) neurofibril…
COMMUNICATION I NERVOUS AND SENSORY SYSTEMS
COMMUNICATION IA- NERVES Introduction The nervous system is a rapid communication system that interacts continuously with the endocrine system to control coordination of body functions. In the vertebrates it plays…
OBJECTIVES OF PROTECTION, SUPPORT AND MOVEMENT
Choose the best choice for the statements from the multiple choices 1-In animals, structure and function have evolved together. Several results of this evolution are (a) protection (b) support (c)…
Protection , Support & Movement in Animals
Introduction An animal is wrapped in a protective covering, the integument, which may be as simple as the delicate plasma membrane of an Amoeba or as complex as the skin…
Origin of organized structures
It took a long time for plants to develop proper roots and vascular system for land dwelling. These carry water drawn through roots to all parts of their bodies -…
The nature of evolutionary forces
The forces which bring about evolutionary changes by natural selection are called evolutionary forces. These forces are random genetic drift, gene flow and mutation. 1. Genetic drift The change in…