Question 1 0.1 pts (Ch.6.2; Signaling pathways) Hormones O travel by diffusion through the extracellular fluid and act on all cells of the body travel through the blood and act on all cells of the body. travel across synapses from neurons to other neurons or sometimes to muscles. travel through the blood and act on cells that have receptors for that hormone. travel through the blood and act on endocrine cells, but not other types of cells.
Question 2 0.1 pts (Ch. 6.5; Homeostatic Reflex Pathways) Which of the following is a correct example of Cannon’s postulate that tonic control is one mechanism that maintains physiological homeostasis? a neuron that fires action potentials at an intermediate rate at rest, but decreases its rate when its stimulus move away from the homeostatic range. neurons increase firing when a predator comes into view. depolarization opens voltage gated sodium channels, which causes more depolarization the parasympathetic versus the sympathetic nervous systems epinephrine constricts some blood vessels and dilates others
Question 3 0.1 pts (Ch. 1.6; The Science of Physiology) In an X-Y plot of an experiment what is usually plotted on the X axis? the dependent variable, which is the parameter that was manipulated. the dependent variable, which is the parameter that was measured. the independent variable, which is the parameter that was measured. o the histogram the independent variable, which is the parameter that was manipulated
. Question 4 0.1 pts (Ch. 6.5; Homeostatic Reflex Pathways) In a homeostatically regulated system negative feedback returns the regulated parameter to an optimal range. paracrine control is required. the regulated parameter, such as body temperature, is constant. the setpoint is always the same. positive feedback is an important mechanism.
Question 5 0.1 pts (Ch.6.5; Homeostatic Reflex Pathways) What is the correct order of events in reflex control systems? O efferent activation, afferent activation, integration, feedback to sensor, response response, feedback to sensor, efferent activation, integration, afferent activation afferent activation, integration, efferent activation, response, feedback to sensor efferent activation, integration, afferent activation, response, feedback to sensor feedback to sensor, integration, afferent activation, efferent activation, response
Question 6 0.1 pts (Ch. 1; Physiological Systems) Which organ system is correctly matched with its function? O overall homeostasis – renal exchange across membranes – endocrine system movement of fluids and gasses – nervous system communication-respiratory energy – digestive system
Question 7 0.1 pts (Ch.6.2; Signaling pathways) Which of the following is a mechanism through which hormones can have their effects in target organs? increase in cytoplasmic calcium concentration by release of calcium from intracellular stores. increases in the transcription of specific genes. increase in cytoplasmic calcium concentration by influx from the extracellular environment. release of calcium by the IP3 pathway. activation of adenylyl cyclase (adneylate cyclase) changes in the cytoskeleton. inhibition of adenylyl cyclase all of the answers are correct

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