Organization, Homeostasis, Neuron Review Worksheet

Name: ________________________________________________________ Date: _______________ Period: _______
Organization, Homeostasis, Neuron Review Worksheet
Directions: Review your notes and textbook to complete this worksheet.
1. In general, fill in the five levels of organization.
2. Place the five examples below in order from smallest to largest?
Elephant, Liver, Tendon, Endocrine system, Neuron
3. Label the descriptions below one of the four parts of the control system:
Sensors, Communication system, Control center, Targets
a. The brain = ____________________________
b. Nerves in your fingers that detect heat = ____________________________
c. Muscles that pull away from cold surfaces = ________________________________
d. Spinal cord that leads to the brain = ______________________________
e. Receptors in your stomach to detect tickles = _____________________________
f. Cells leading from your brain to your legs = __________________________________
g. Endocrine system which releases hormones throughout your body = _________________________
4. Read the following situations and label whether the situation describes positive or negative feedback.
Situation 1: As a person gets dehydrated, their blood becomes thicker and harder to pump. As this happens, the
kidneys stop producing urine and the water from urine is redirected for use in the blood.
Situation 2: As a person’s blood sugar lowers, the pancreas releases a chemical called glucagon to return the blood
sugar back to normal.
Situation 3: Rapid growth during puberty causes the release of more growth hormones.
Situation 4: As a person’s blood sugar rises, the pancreas releases a hormone called insulin to return the blood
sugar back to normal.
Situation 5: When tissue is injured, they release chemicals to activate platelets to stop bleeding. Platelets then
release more chemicals to activate even more platelets to help stop bleeding.
Situation 6: When a baby suckles milk from his/her mother, a nerve in the mother’s nipple sends a signal to her
brain which stimulates the production of more milk.
Situation 7: If calcium in the blood decreases, the parathyroid glands sense the decrease and secrete a hormone to
release calcium from the bones, into the bloodstream.

5. Label the drawing above with the words (one choice
will not be used):
Axon, Synapse, Cell body, Action potential, Dendrites
6. Neurotransmitters are released in which area? _______
7. Which area contains the majority of the organelles
found within the cell? __________
Neuron Structure
8. Which area leads away from the cell body? __________
9. Vesicles are released from cells in which area? _______
10. Electrical impulses are converted into chemical
molecules in which area? _________
11. Which area leads towards the cell body? __________
Action Potential: Examine the two neurons below.
12. If the impulse is traveling from cell A to cell B, cell A
would be the:
a. Dendrite c. Cell body
b. Axon terminal d. Synapse
13. If the impulse is traveling from cell A to cell B, cell B would
be the:
a. Dendrite c. Cell body
b. Axon terminal d. Synapse
14. In which area is an impulse releasing neurotransmitters?
1 2 3 4 5
15. Which area shows the vesicles?
1 2 3 4 5
16. Which area shows the dendrite receptors?
1 2 3 4 5
17. Which area shows the synapse?
1 2 3 4 5
18. Which area shows a neurotransmitter molecule?
1 2 3 4 5