CFI ICT101 Test 1

To maintain Homeostatsis

• -) 60% (45 L) of total body weight
• -) 7% of total body fluid
• -) 25% of total body fluid
• -) 66% of total body fluid

Responsible for the continual process of supplying fresh nutrients and wast disposal

• - 100%
• - 21%
• - 21%
• - 15%
• - 14%
• - 6%
• - 5%
• - 3%

If radius is down by 50% then resistance increases 16 times

- Blood flow through all organs is passive and occurs only because arterial pressure is kept hight than venous pressure

- Right heart produces energy to move blood through pulmonary vessels

- Left heart produces energy to move blood through system organs.

- Conduit Vessels, thick wall vessels, contain smooth muscle, large amounts of Elastin and collagen fibers, and can stretch 2 times original size

- Resistance vessels, smaller than arteries, thicker walls w/more smooth muscle and less elastic tissue, muscles may be stimulated by change of diameter of vessel, more numerous than arteries, regulate peripheral blood flow through organs

- Exchange vessels, smallest of vessels, RBCs must reform to pass through, single layer of endothelium, contain no smooth muscle and have no diameter change, exchange btwn blood and interstial fluid, exchange of fluid volumes between plasma and interstitial space takes place.

A rapid voltage change triggered by contraction that occurs in cell membrane.

- Increase or decrease of HR and impacted by concentration of Ca+

- Affects conduction speed related to AV Node

- Affects muscles contractility

Increases HR; Adrenergic sympathetic nerve fibers; Influences all portions of heart; releases NE on myoctyes; increases cardiac pumping

Decreases HR; stimulation of vagus nerve; Influences nodal tissue (SA Node); Releases ACH; Increases permeability to K+ and decreases diastolic permeability to Na+