The graph below illustrates the feedback mechanism of the regulation of blood glucose levels over time in a normal patient.
Based on the graph, which explanation best explains how this
feedback system helps to maintain homeostasis for blood glucose
levels?
140
120-
100-
insulin
glucagon
glucagon
insulin
Set
point
80
blood glucose concentration (mg 100cm)
60
glucose absorbed
glucose-glycogen:
ascongestoko
about 6a503nib
glucose absorbed
40
1
meal
meal
20-
0
7am
Bam
gam
10am
11 am
12am
1pm
2 pm

What initially causes a nerve impulse? release of enzymes out of the neuron movement of chemicals into the dendrites of the neuron pathogens attacking the dendrites of the neuron red blood cells bathing the neuron

Sally and sue were investigating the topic of friction in science. they used a small car and a ramp as seen in the picture to test what they were learning. they knew that they slipped easily on waxed floors but not on carpet, so they decided to change the material on the surface of the ramp to see what happened. they planned to use glass, carpet, aluminum foil, and sandpaper and run the car down the ramp over each surface. what would be the best research question to guide the girls' experiment? a) does the amount of surface area affect the friction on the moving car? b) will the car travel fastest on the glass surface? c) how does the angle of the ramp affect the speed of the car? d)do rougher surfaces tend to create more friction than smooth surfaces?

Why are scientists concerned about the depletion of the ozone levels in the stratosphere?