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HUMAN skeleton
1. What is the primary function of the human skeleton?
a) Digestion
b) Respiration
c) Support and protection
d) Circulation
2. Approximately how many bones are in the adult human skeleton?
a) 106
b) 306
c) 206
d) 406
3. What is the name of the strong, fibrous connective tissue that connects bones to each other at joints?
a) Tendons
b) Ligaments
c) Cartilage
d) Periosteum
4. What is the name of the flexible connective tissue that cushions joints and is found in the nose and ears?
a) Cartilage
b) Ligaments
c) Tendons
d) Bone
5. What is the name of the membrane that covers the outer surface of bones?
a) Endosteum
b) Periosteum
c) Cartilage
d) Marrow

Bone Identification:

6. What is the longest bone in the human body?
a) Humerus
b) Tibia
c) Femur
d) Ulna
7. What is the name of the bone located in the upper arm?
a) Radius
b) Ulna
c) Humerus
d) Fibula
8. What bones protect the brain?
a) Ribs
b) Vertebrae
c) Cranium
d) Pelvis
9. What is the name of the bone commonly known as the "collarbone"?
a) Scapula
b) Clavicle
c) Sternum
d) Humerus
10. What is the name of the bone in the lower leg that is smaller than the tibia?
a) Ulna
b) Radius
c) Fibula
d) Humerus

Bone Structure & Function:

11. What is the hard, dense outer layer of bone called?
a) Spongy bone
b) Compact bone
c) Marrow
d) Cartilage
12. What is the name of the spongy, porous inner layer of bone?
a) Compact bone
b) Spongy bone
c) Marrow
d) Cartilage
13. What type of bone marrow produces blood cells?
a) Yellow bone marrow
b) Red bone marrow
c) Cartilage
d) Compact bone
14. What mineral is primarily stored in bones?
a) Iron
b) Sodium
c) Potassium
d) Calcium
15. What type of bone cell breaks down bone?
a) Osteoclasts
b) Osteoblasts
c) Chondrocytes
d) Fibroblasts

Joints and Movement:

16. What type of joint allows for the greatest range of motion?
a) Hinge joint
b) Ball-and-socket joint
c) Gliding joint
d) Pivot joint
17. What type of joint allows for movement in one plane only?
a) Ball-and-socket joint
b) Hinge joint
c) Gliding joint
d) Pivot joint
18. What type of joint allows only gliding movements?
a) Hinge joint
b) Ball-and-socket joint
c) Gliding joint
d) Pivot joint

Skeletal System Disorders:

19. What condition is characterized by decreased bone density?
a) Arthritis
b) Osteoporosis
c) Scoliosis
d) Gout
20. What is the term for a break in a bone?
a) Dislocation
b) Sprain
c) Strain
d) Fracture


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🔥 What is Gibbs Free Energy (G)?

👉 It’s a special kind of energy that tells us whether a chemical reaction will happen on its own or not.
💡 Simple Meaning:

Gibbs Free Energy is the energy available to do useful work in a system at constant temperature and pressure.

Real-Life Example:

Ice melting at room temp:


ΔH > 0 (absorbs heat)


But ΔG < 0, so it happens spontaneously! ❄️➡️💧




🌟 Key Takeaways:
Gibbs Free Energy helps predict the direction of a chemical reaction


It’s about the balance between heat and disorder


Lower ΔG = more favorable reaction 🧠

⚖️🎯 What’s the difference between the End Point and the Equivalence Point in titration?


🎯 Equivalence Point:
✅ It's the theoretical point where the amount of acid = the amount of base
🔬 Chemically, neutralization is complete
📍 Determined by stoichiometry, not color


🌈 End Point:
✅ It's the experimental point where the indicator changes color
👁️ This is what you actually see in the lab
⚠️ It should be as close as possible to the equivalence point, but they’re not exactly the same
🧪 Example:
In an acid-base titration using phenolphthalein:

Equivalence point: Neutralization happens (H⁺ = OH⁻)


End point: The solution changes from colorless to pink 🌸


📌 In short:🧠 Equivalence point = theoretical completion
👀 End point = visual signal that we use to stop titration