Thermoregulation, Glucose Metabolism,

andFrog Reflexes Lab

1st Quiz18 Sept 2009

Circle the letter of all correct responses for each question!

Write your name on upper edge of back side only.

# 1

• During the post-absorptive state, what is the fate of glucose in the liver?

• a) converted to glycogen• b) converted to triglycerides• c) converted to amino acids• d) generated from several sources and

released into the plasma.

# 2

• During the absorptive state, what is the fate of glucose in adipose cells?

• a) taken in by Glut-4 facilitated transport membrane proteins

• b) converted to fatty acids• c) converted to α glycerol phosphate• d) large amounts of glucose are released into

the plasma

#3

• Insulin promotes (stimulates)• a) glycogenesis• b) the formation of triglycerides• c) gluconeogenesis• d) glucose uptake by adipocytes• e) pyruvate release from muscle cells.

#4• Which of the following is/are afferent pathways

in the feedback loop for glucose homeostasis?• a) Alpha cells in Islets of Langerhans• b) Beta cells in Islets of Langerhans• c) epinephrine• d) insulin• e) glucagon • f) sympathetic nerves

None of these are afferent pathways! The integrators (alpha and beta cells) are also the receptors.

#5

• Which of the following can suppress insulin secretion?

• a) decreased plasma glucose concentration• b) increased plasma amino acid concentration• c) increased activity of the parasympathetic

nervous system• d) increased plasma epinephrine.

#6• In a person with reactive hypoglycemia during

the second hour after drinking the Oral Glucose Tolerance Test beverage containing glucose,

• a) plasma glucose levels are lower than normal• b) glucagon secretion should be increased• c) levels of epinephrine would be elevated • d) a headache is likely as cerebral blood vessels

dilate to provide brain tissue with glucose.

#7

• Smelling the aroma of burgers on the grill can trigger the secretion of ______ which is an example of _______.

• a) epinephrine………..buffering• b) glucagon……..adaptation• c) insulin ……….feedforward• d) epinephrine…..natural selection

#8

• Which of the following is an effector in the negative feedback loop for thermoregulation?

• a) cutaneous arterioles• b) hypothalamus• c) cerebral cortex• d) epinephrine• e) sweat glands• f) skeletal muscles

#9• During the post-absorptive phase, which is/are

true:• a) insulin levels are low• b) glucagon levels are high• c) neurons use fatty acids as their major source

of energy• d) most cells switch from using glucose as their

primary fuel source to ketones and fatty acids.

#10

• Which of the following responses are eliminated when the brain of a frog is completely pithed?

• a) righting response• b) corneal reflex• c) wiping reflex• d) orientation of the head with respect to gravity

and visual cues.

#11• In the space remaining on the

bottom of the answer sheet, describe the heat exchange mechanisms involved when a person jumps into icy cold water

This is a timed response. Stop writing when the signal is given.