Search results for: 'SI'

Watch Later 2:13

By: HWC, Views: 9323

• The flexor reflex is a response to pain. This reflex is polysynaptic, ipsilateral, and intersegmental. • Pain receptors are stimulated causing increased frequency of action potentials to be generated and conducted along the sensory neuron axon. • The sensory impulses excite several ass...

Watch Later 1:58

Homeostasis (range of body conditions, normal limits, mild stresses & severe stresses)

By: HWC, Views: 9275

Homeostasis: • Provides relative stability of the internal environment. • Results from constant adjustments. • Regulated by regulatory processes. • Requires system interplay. • Normal limits. • Temporary stresses. • Disruptions requiring medical intervention. • D...

Watch Later 3:04

Component of feedback systems & Communication and regulation of body systems

By: HWC, Views: 9501

• Primary responsibility for communication and regulation in the body is shared by the nervous and endocrine systems. • The two systems work alone or together in specialized physiological processes called feedback systems to maintain homeostasis. • Feedback systems - or loops - are ...

Watch Later 0:25

Stimulus (introduction)

By: HWC, Views: 9061

• Blood pressure determines the flow of blood to and from capillaries. • Low blood pressure results in reduced blood flow. • High blood pressure can cause blood vessels to break. In humans, sensitivity is due to portions of the nervous system called receptors. Receptors are typicall...

Watch Later 1:34

Lipid digestion - mouth, stomach and small intestine

By: HWC, Views: 9420

• Lipid digestion takes place primarily in the small intestine; some occurs in the mouth and stomach. • Lipases are enzymes that break down triglycerides and phospholipids. • Lingual and gastric lipases hydrolyze a small amount of triglycerides. • End products are fatty acids and...

Watch Later 1:01

Gastrin (gastric emptying) & Secretin (buffering gastric acid)

By: HWC, Views: 8911

• Gastrin also binds to the smooth muscle cells in the stomach causing: • Increased gastric motility. • Opening of pyloric sphincter. • Increased gastric emptying. • The intestinal phase of digestion begins as chyme enters the duodenum. • The chyme's acidity can damage int...

Watch Later 1:46

Mechanisms of capillary exchange (transcytosis & bulk flow)

By: HWC, Views: 9047

■ This method of capillary exchange is mainly used to transport small amounts of large, lipid-insoluble (water soluble) molecules, such as large proteins. ■ Substances, packaged in vesicles, move through endothelial cells via endocytosis and exocytosis. ■ This method of exchange is th...

Watch Later 1:16

Structures that affect circulation - kidneys, blood volume and venous tone

By: HWC, Views: 9322

• Kidneys regulate blood volume and blood osmolarity via salt and water reabsorption. • Increased reabsorption increases blood volume and venous return (and CO). • Decreased reabsorption increases urine production, which decreases blood volume and venous return (and CO). • Systemi...

Watch Later 1:34

Gastrin (protein digestion)

By: HWC, Views: 9440

The endocrine system maintains many body conditions within normal limits with feedback loops. Each endocrine feedback loop maintains homeostasis using the following components: • Stimulus - a change in a body condition. • Production cell - an endocrine cell that produces a hormone after b...

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