ENDOCRINE SYSTEM

Human Endocrine System
Free tutorial
Rating: 4.4 out of 5 (13 ratings)
664 students
1hr 15min of on-demand video
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Identify the contributions of the endocrine system to homeostasis
Discuss the chemical composition of hormones and the mechanisms of hormone action
Summarize the site of production, regulation, and effects of the hormones of the pituitary, thyroid, parathyroid, adrenal, and pineal glands

Requirements

  • Basic Biology

Description

The nervous system uses two types of intercellular communication—electrical and chemical signaling—either by the direct action of an electrical potential, or in the latter case, through the action of chemical neurotransmitters such as serotonin or norepinephrine. Neurotransmitters act locally and rapidly. When an electrical signal in the form of an action potential arrives at the synaptic terminal, they diffuse across the synaptic cleft (the gap between a sending neuron and a receiving neuron or muscle cell). Once the neurotransmitters interact (bind) with receptors on the receiving (post-synaptic) cell, the receptor stimulation is transduced into a response such as continued electrical signaling or modification of cellular response. The target cell responds within milliseconds of receiving the chemical “message”; this response then ceases very quickly once the neural signaling ends. In this way, neural communication enables body functions that involve quick, brief actions, such as movement, sensation, and cognition.In contrast, the endocrine system uses just one method of communication: chemical signaling. These signals are sent by the endocrine organs, which secrete chemicals—the hormone—into the extracellular fluid. Hormones are transported primarily via the bloodstream throughout the body, where they bind to receptors on target cells, inducing a characteristic response. As a result, endocrine signaling requires more time than neural signaling to prompt a response in target cells, though the precise amount of time varies with different hormones. For example, the hormones released when you are confronted with a dangerous or frightening situation, called the fight-or-flight response, occur by the release of adrenal hormones—epinephrine and norepinephrine—within seconds. In contrast, it may take up to 48 hours for target cells to respond to certain reproductive hormones.

Who this course is for:

  • HSC, Pharmacy, Nursing

Instructor

Pharmacist
Komal Mahajan
  • 4.1 Instructor Rating
  • 56 Reviews
  • 2,811 Students
  • 5 Courses

Komal Mahajan is working as an Assistant Professor in K. K. Wagh College of Pharmacy, Nashik, one of the leading brands in education field. She has total teaching experience of 06 years. She has completed her B. Pharm and M. Pharm from Sanjivani College of Pharmaceutical Education & Research,Kopargaon with excellent academic records.

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