Questions: 1. A person forgets to drink water, becoming dehydrated during hot yoga. 2.5 pts - Prediction: initially, then - Justification: - APA Reference: 2. A patient is given a drug that causes vasoconstriction. 2.5 pts - Prediction: initially, then - Justification:

Prediction: Initially, blood pressure may decrease, then increase after compensatory mechanisms kick in.

Justification: Dehydration leads to a decrease in blood volume, which can initially cause a drop in blood pressure. However, the body has compensatory mechanisms to counteract this. The renin-angiotensin-aldosterone system (RAAS) is activated, leading to vasoconstriction and retention of sodium and water, which helps to increase blood volume and blood pressure. Additionally, antidiuretic hormone (ADH) may be released to conserve water, further aiding in the restoration of blood pressure.

APA Reference: Guyton, A. C., & Hall, J. E. (2016). Textbook of Medical Physiology (13th ed.). Elsevier.

Prediction: Initially, blood pressure will increase, then it may stabilize or slightly decrease after compensatory mechanisms kick in.

Justification: Vasoconstriction increases peripheral resistance, which leads to an increase in blood pressure. Over time, the body may attempt to compensate for the increased blood pressure by adjusting cardiac output or through baroreceptor reflexes, which can lead to a stabilization or slight decrease in blood pressure. However, the extent of these compensatory mechanisms depends on the duration and intensity of the vasoconstriction.

APA Reference: Hall, J. E. (2016). Guyton and Hall Textbook of Medical Physiology (13th ed.). Elsevier.