HPHY 325 Midterm 1 exam 2024 with 100% correct answers

Organismal homeostasis mechanisms regulate variables in what environment? - correct answer Within the fluid surrounding the cells as well as the plasma and the lymph What is true of only the endocrine system and not the nervous system? - correct answer Hormones travel through the blood stream Homeostatically regulated variables always have a sensor (receptor) to monitor the environment and respond to changes outside the normal range - correct answer True Neurotransmitters are most likely what type of chemical signal? - correct answer Paracrines Baroreceptors detect blood pressure. Blood pressure is maintained relatively constant even when the internal or external environment changes. Under what conditions do baroreceptors send signals to the brain? - correct answer At all levels of blood pressures What hormone mainly has its effect of target cells by activating genes and transcribing proteins? - correct answer Thyroid hormone T3/T4 A ripe apple on a tree produces the molecule ethylene. This molecule causes the surrounding apples to ripen, and they in turn produce ethylene until all of the apples on the tree are ripe. What is this process an example of? - correct answer Positive feedback system Norepinephrine has many effects on the body, including vasodilation of vessels. What is the molecular mechanism by which NE acts which this is achieved? - correct answer NE, unable to cross the lipid belayer, binds to a membrane bound receptor G protein coupled receptor When there is an increase in blood pressure, the medulla commands the blood vessels to decrease peripheral resistance, in order to bring MAP back to normal range. In this homeostatic mechanism, which of t