ULTRASTRUCTURE CELL ULTRASTRUCTURE Cells are the smallest functional units of the body‚ (Waugh‚ A. and Grant‚ A.2010). Most cells are microscopic. The largest cell in the body is the female ovum. The erythrocyte is the smallest cell. The longest cell is the neuron. Cells group together to form tissues‚ each of which has specialised function. Different tissues group together to form organs. Organs are group together to form organ systems‚ each of which performs a particular function that maintains the homeostasis
Premium Cell Neuron Cell membrane
5. SYMPATHETIC VS PARASYMPATHETIC What are some things that happen when you get scared? When you have just had a big meal? 6. Draw the Graphic Organizer for the nervous system 7. ANATOMY OF A NEURON with a MYELIN SHEATH [pic] |Nerve Part |Function / Description | |SOMA (cell body) |
Premium Nervous system Neuron
of synaptic changes. At a neurobiological level‚ learning is “created” by the interconnectedness between neurons (synapses). Hebb proposed that if the postsynaptic neuron fired while the presynaptic terminal was releasing neurotransmitter (NT)‚ the presynaptic neuron would be more likely to influence the postsynaptic neuron on subsequent occasions‚ i.e. when previously unassociated neurons fire simultaneously on repeated occasions‚ new links are formed which increase synaptic efficiency (Hebbian
Premium Classical conditioning Neuron Action potential
Explain why psychologists are concerned with human biology. 2. Describe the structure of a neuron‚ and explain how neural impulses are generated. 3. Describe how nerve cells communicate‚ and discuss the impact of neurotransmitters and drugs on human behavior. 4. Identify the major divisions of the nervous system and describe their functions‚ noting the three types of neurons that transmit information through the system. 5. Contrast the simplicity of the neural pathways
Premium Neuron Nervous system Action potential
networks with input data normalised by column‚ row‚ sigmoid‚ and column constrained sigmoid normalisation. Also contained within the paper is an analysis of the performance results of back propagation neural networks with various numbers of hidden layer neurons‚ and differing number of cycles (epochs). The analysis of the performance of the neural networks is based on several criteria: incorrectly identified plants by training set (recall) and testing set (accuracy)‚ specific error within
Premium Data Neural network Output
Immaculate Heart of Mary College SY 2012-2013 BIOLOGY EXCRETORY SYSTEM MODULE Urea is the main nitrogenous waste excreted by most mammals and is formed in the liver. It circulates the body and most of the urea produced by the body is transported to the kidneys. ORGANS OF EXCRETION ORGAN | WASTE EXCRETED | Skin | Sweat | Lungs | Carbon dioxide | Liver | Water‚ salts | Large intestine | Feces | Kidneys | Urine | THE KIDNEYS The kidneys are the main organs of excretion
Premium Nervous system Neuron Brain
The basal lamina of the cerebral microvasculature is in close connection to astrocytes and neurons that regulate the surrounding microcirculation‚ hence it is termed intrinsic innervation. Intrinsic afferents originate from subcortical neurons‚ such as the basal forebrain‚ the raphe nucleus‚ locus coreuleus or local cortical interneurons [63‚ 64]; however this type of innervation targets mainly astrocytes rather than
Premium Brain Nervous system Neuron
homeostasis II. Nerve Tissue A. Neurons (structural & functional units of nervous system) B. Neuroglial Cells (accessory cells: support neurons) 1. Astrocytes (star shaped cell) a. found between neurons and blood vessels b. provide nutrition c. support d. form scar tissue after brain tissue injury (multiply) 2. Oligodendrocytes a. smaller than astrocytes with fewer processes b. found along neurons c. form myelin sheath (brain and spinal cord neurons) 3. Microglia a. very small cells
Premium Nervous system Neuron Action potential
They cause smooth muscle contractility and inhibit neurotransmitters from being released from the pre-synaptic neurons. They prevent norepinephrine from being released from adrenergic neurons and acetylcholine from being released from cholinergic neurons. On pancreatic beta cells‚ they hinder insulin from being released. Beta 1 receptors are known as ADRB1‚ which is a G-protein coupled receptor‚ associated with the heterotrimeric
Premium Nervous system Hypertension Hypothalamus
Response of Behavior To explain the communication process of neurons in the brain we must first understand the how a neuron works. In view of the fact that neurons form a network of electrical activities‚ they somehow have to be interconnected. When a nerve indicator‚ or impulse‚ reaches the ends of its axon‚ it has traveled as an action potential‚ or a pulse of electricity. However‚ there is no cellular continuity between one neuron and the next; there is a breach called synapse. The membranes
Premium Neuron Neurotransmitter Action potential