Practice quiz · by a Quizcard user
Anatomy and Physiology: Muscular and Skeletal Systems — quiz
17 multiple-choice questions covering Bone Tissue & Cells, Long Bone Anatomy, Ossification & Remodeling, Calcium Homeostasis, Axial Skeleton. One answer each; you get a score at the end and the explanation for every question. No account needed.
Updated 2026-11-03. Keys 1–4 pick an answer, Enter moves on. Redo it any time, in order or shuffled.
The questions
Answers and explanations are shown after you finish.
- Bone Tissue & Cells
A patient takes a medication that selectively inhibits osteoclast activity. What is the most likely effect on bone tissue?
- Decreased bone formation due to osteoblast dysfunction
- Increased calcium release into the bloodstream
- Increased osteocyte death within lacunae
- Decreased bone resorption, leading to increased bone density
- Bone Tissue & Cells
Which feature distinguishes spongy (cancellous) bone from compact bone?
- Composed of trabeculae and contains red marrow
- Organized into osteons with central canals
- Lacks lacunae and canaliculi entirely
- Forms the dense outer shaft of long bones
- Bone Tissue & Cells
A bone sample is treated to remove all mineral content (hydroxyapatite) while keeping collagen intact. How would this bone most likely behave physically?
- Unable to resist any mechanical stress
- Extremely brittle and prone to shattering
- Unchanged compared to normal bone
- Rubbery and flexible, bending without breaking
- Long Bone Anatomy
On a growing child's X-ray, a radiolucent cartilaginous band appears between the shaft and the rounded end of a long bone. Which region does this represent?
- Diaphysis
- Periosteum
- Metaphysis region, containing the epiphyseal plate
- Epiphysis
- Long Bone Anatomy
Which bones in an adult typically retain red marrow for blood cell production even though most of the skeleton contains yellow marrow?
- Radius and ulna
- Patella and fibula
- Sternum, ilium, and vertebrae
- Phalanges and metacarpals
- Ossification & Remodeling
The clavicle develops directly from mesenchymal tissue without ever forming a cartilage model first. Which ossification process does this describe?
- Interstitial growth
- Intramembranous ossification
- Appositional growth
- Endochondral ossification
- Ossification & Remodeling
An astronaut experiences significant bone density loss in weight-bearing bones after months in microgravity. Which principle best explains this?
- Increased calcitonin release
- Wolff's Law — reduced mechanical stress leads to bone resorption
- Impaired collagen synthesis
- Excess PTH secretion
- Calcium Homeostasis
A patient presents with low blood calcium. Which hormonal response would you expect?
- Decreased renal calcium reabsorption
- Increased calcitonin release to inhibit osteoclasts
- Decreased vitamin D activation
- Increased PTH release, stimulating osteoclast activity and renal calcium reabsorption
- Calcium Homeostasis
After a calcium-rich meal, blood calcium rises above normal. Which hormone acts to lower it, and by what mechanism?
- PTH, by stimulating osteoclasts
- Vitamin D, by increasing intestinal absorption
- Calcitonin, by inhibiting osteoclast activity
- Glucagon, by promoting bone formation
- Axial Skeleton
Which combination of structures belongs to the axial skeleton?
- Scapula, humerus, and pelvis
- Clavicle, femur, and tibia
- Skull, vertebral column, rib cage, and hyoid bone
- Carpals, metacarpals, and tarsals
- Appendicular Skeleton
Tracing the upper limb bones from proximal to distal, which sequence is correct?
- Humerus → metacarpals → carpals → phalanges
- Scapula → carpals → radius/ulna → humerus
- Humerus → radius/ulna → carpals → metacarpals → phalanges
- Radius/ulna → humerus → metacarpals → carpals
- Joints
A patient's thumb joint allows a wide range of motion, including opposition, and is formed by two saddle-shaped articulating surfaces. Which synovial joint type is this?
- Hinge joint
- Pivot joint
- Saddle joint
- Condyloid joint
- Muscle Fiber Structure
During a muscle biopsy viewed under polarized light, a region containing only thin filaments with no thick filament overlap is identified. Which sarcomere zone is this?
- A band
- I band
- H zone
- M line
- Muscle Fiber Structure
A toxin blocks troponin's ability to bind calcium. What would be the most direct physiological consequence?
- Myosin heads detach permanently from actin without ATP
- Calcium is released continuously from the SR
- Tropomyosin cannot move off the myosin-binding sites, preventing contraction
- Actin filaments lose their binding sites for ATP
- Sliding Filament Mechanism
In the cross-bridge cycle, what event immediately follows the power stroke?
- Ca2+ binds troponin
- Tropomyosin moves to expose binding sites
- ATP hydrolysis re-cocks the myosin head
- ATP binds myosin, causing its detachment from actin
- Sliding Filament Mechanism
During maximal muscle shortening, which sarcomere band does NOT change in length?
- I band
- Distance between Z-discs
- H zone
- A band
- Neuromuscular Junction
At the neuromuscular junction, which event directly causes acetylcholine release into the synaptic cleft?
- Depolarization of the T-tubules
- Opening of ligand-gated Na+ channels on the motor end plate
- Acetylcholinesterase breaking down ACh
- Calcium influx through voltage-gated channels in the axon terminal
Try it with your own material
Paste notes, upload a PDF, or pick any of your decks and Quizcard writes a quiz with explanations in about a minute. Quizzes from your own decks are free.