They consist of a soma containing the nucleus on one end of the nerve cell, with one protoplasmic process. They are the only examinable nerve cell that does not exist in the human nervous system. Unipolar neurons (1) are a form of sensory (afferent) nerve cell that is found only in invertebrates. As shown below, the structure of each of these nerve cells differ slightly. Types of Nerve Cellsįour main types of neurons could be examined. Finally, the electrical impulse is converted to a chemical impulse and transmitted across the synaptic cleft to the dendrite of the postsynaptic nerve cell. This impulse will then travel as an electrical impulse down the axon and cell body, to the telodendrion, the terminal part of the axon. One end of the nerve cell consists of the dendrite, which is initially depolarized through chemical synapses from other neurons. The axon is often covered by a myelin sheath. The basic structure of a nerve cell consists of a cell body, with a nucleus, that is connected to a long extension called an axon. As a result, the lifespan of a neuron in a human brain can last over 100 years. This means that although pathways between these cells can grow, develop, or reduce over time, the cell population stays relatively stable through human life. Nerve cells are one of the few cell types within the body called ‘permanent cells’. They are complex cells, all specialized and subspecialized to optimize their function depending on their location and role. Nerve cells, or neurons, are the building blocks of the human nervous system, allowing for all movements within the body, from waving an arm around to regulating the heartbeat. An introduction to nerve cells for the MCAT This will put all the information in one place that you need to score highly on the nerve cell questions of the test.
To keep things simple we’ve created a handy nerve cell study guide for the MCAT. Nerve cells, which are included in the Biological and Biochemical Foundations of Living Systems section of the exam, are just one of many MCAT subjects which you’ll need to know well. A good starting point when preparing for the MCAT is to familiarize yourself with the syllabus and identify topics that you’ll need to study.
0 kommentar(er)
