Heart Review II

pg 17 of Study guide

Decreased venus return to heart, low cardiac output, less blood to brain, pass out

• Valsalva maneuver; forced expiration on closed glottis-
• puts a lot of pressure in thoracic cavity nad it closes the great veins off so there is no venus return to heart and no cardiac output to brain

Plasma osmolality/osmolarity measures the body's electrolyte-water balance

• Dehydration and salt ingestion---> increase osmolaility
• detected by the osmorepector in hypothalamus
• 1. It'll create the sensation of thirst, drink more water, decrease osmolaility, increase blood volume
• 2. It'll send info to post. pituitary to secrete ADH, which increase water retention from kidney, decrease osmolaility, increase blood volume

• Heart actions
• 1. Stroke volume
• 2. Cardiac output
• Resting conditions