Cell Balance Matching Worksheet
Biology • Cell Dynamics | Unit 3: Energy & Homeostasis
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Cell Energy & Homeostasis Match
Mastering key vocabulary across cellular metabolism, feedback regulation, and water balance.
Assessment 10 Pairs • 10 Points
Instructions: Match each biological term in Column 1 with its correct scientific definition in Column 2. Write the capital letter of the best definition in the blank space __ next to each number. Each letter will be used exactly once.
Column 1: Scientific Terms
Column 2: Definitions & Functions
1. Cellular respiration
A Organelle where aerobic respiration happens.
2. ATP
B Movement of water toward the side with more solute.
3. Mitochondrion
C A response that reverses a change.
4. Homeostasis
D Uses glucose and oxygen to produce ATP.
5. Negative feedback
E More solute outside; the cell shrinks.
6. Effector
F Blood sodium that is too low (below 135 mmol/L).
7. Osmosis
G Molecule that delivers energy to the cell.
8. Hypotonic
H Less solute outside; the cell swells.
9. Hypertonic
I Keeping internal conditions stable.
10. Hyponatremia
J Organ or muscle that carries out the response.
Part 2: Clinical Application Scenario (2 Bonus Points)
Critical Thinking
An endurance athlete finishes a race and drinks 4 liters of plain water rapidly. Their blood sodium drops sharply, causing confusion and dizziness. Identify the condition they are experiencing, explain which tonicity term describes their extracellular fluid, and describe what happens to their brain cells via osmosis.
Cell Balance Matching Answer Key
Teacher Guide & Answer Key | Unit 3: Cell Dynamics & Homeostasis
Official Solution Guide
Cell Energy & Homeostasis Match — Answer Key
Quick grading strip, complete matching rationales, and clinical scenario exemplar.
Total Points 12 Pts (10 Match + 2 Bonus)
Quick Key Fast Grading Strip:
1:D 2:G 3:A 4:I 5:C 6:J 7:B 8:H 9:E 10:F
| Item | Vocabulary Term | Match | Matching Definition & Teacher Rationale |
|---|
| 1 | Cellular respiration | D | Uses glucose and oxygen to produce ATP. Catabolic pathway yielding ~30-32 ATP per glucose. |
| 2 | ATP | G | Molecule that delivers energy to the cell. Adenosine triphosphate powers active transport and mechanical work. |
| 3 | Mitochondrion | A | Organelle where aerobic respiration happens. Site of Krebs cycle and oxidative phosphorylation. |
| 4 | Homeostasis | I | Keeping internal conditions stable. Dynamic equilibrium maintaining physiological set points. |
| 5 | Negative feedback | C | A response that reverses a change. Counteracts deviations (e.g., sweating when body temperature rises). |
| 6 | Effector | J | Organ or muscle that carries out the response. Receives command from control center to act. |
| 7 | Osmosis | B | Movement of water toward the side with more solute. Passive diffusion down water's chemical gradient. |
| 8 | Hypotonic | H | Less solute outside; the cell swells. Memory tip: "Hypo" = like a hippo (swells up). |
| 9 | Hypertonic | E | More solute outside; the cell shrinks. High external solute draws water out of cytoplasm. |
| 10 | Hyponatremia | F | Blood sodium that is too low (<135 mmol/L). Water intoxication causing cerebral edema. |
Part 2 Exemplar Student Response
Full Credit (2 pts): "The runner is suffering from hyponatremia. Excessive plain water diluted their blood, making the extracellular fluid hypotonic relative to brain cells. By osmosis, water moved down its gradient into the brain cells, causing them to swell and create intracranial pressure (headache/confusion)."
Rubric: 1 pt for identifying hyponatremia & hypotonic fluid; 1 pt for describing water inward flux via osmosis causing swelling.
High-Frequency Student Misconceptions
- Negative Feedback: Students often think "negative" means harmful. Clarify it means negating or opposing the initial stimulus back to set point.
- Hypo vs. Hypertonic: Remind students tonicity refers to the surrounding solution relative to the cell, not the water amount alone.
- Effector vs. Receptor: Effectors carry out action (muscle/gland); sensors/receptors detect stimulus.
