hbs Benchmark 1

Enter your Student ID and answer each item. This is a growth check against the WebXam blueprint, not a grade.

1. 1. Osteoblasts build bone; osteoclasts:

   ABreak down boneBBuild bone fasterCCarry oxygenDSend nerve signals

2. 2. A muscle shortens when:

   AMyosin pulls actin toward the centerBThe filaments themselves shrinkCThe bone dissolvesDNerves lengthen

3. 3. The central nervous system is the:

   ABrain and spinal cordBArms and legsCHeart and lungsDSkin and nails

4. 4. At a synapse, the signal crosses mainly by:

   ANeurotransmitters crossing the gapBNeurons fusingCBones touchingDBlood pressure

5. 5. In negative feedback, a rise in output causes the body to:

   ABring the output back downBPush it higherCIgnore itDShut off forever

6. 6. After a meal, the pancreas releases insulin, which:

   ALowers blood glucoseBRaises blood glucoseCStops the heartDBuilds bone

7. 7. Blood returning from the body enters the heart first at the:

   ARight atriumBLeft ventricleCAortaDLeft atrium

8. 8. Gas exchange in the lungs happens across the:

   AAlveoliBStomach liningCLarge bonesDSkin only

9. 9. "Proximal" means:

   ACloser to the trunk or attachmentBFarther from the trunkCToward the backDToward the head

10. 10. A cut into left and right halves is along the:

    ASagittal planeBTransverse planeCFrontal planeDNo plane

11. 11. The heart and lungs sit mainly in the:

    AThoracic cavityBAbdominal cavityCCranial cavityDPelvic cavity

12. 12. Which is one of the four basic tissue types?

    AEpithelialBSagittalCProximalDThoracic

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