Cuestionario: Muscle and Tendon Biomechanics — 9 preguntas

1. What is the primary composition of tendons that enables them to transmit force from muscle to bone?

A. Adipose tissue cells

B. Elastic fibers

C. Collagen type I fibrils

D. Cartilage matrix

Answer: (C)

Explicación

Tendons are mainly composed of collagen type I fibrils, which form fibers and bundles that provide high tensile strength necessary for transmitting force from muscles to bones. This organized collagen structure is essential for their function.

2. What is the primary structural protein found in tendons that provides tensile strength?

A. Elastin

B. Collagen type I

C. Reticulin

D. Actin

Answer: (B)

Explicación

Collagen type I is the main structural protein in tendons, forming fibrils that give tendons their tensile strength. Elastin is more elastic and found in elastic tissues, not primarily in tendons.

3. Which statement best describes the elasticity of tendons and the consequence of overstretching them?

A. Tendons have moderate elasticity, allowing safe stretching during movement

B. Tendons are highly elastic and can stretch significantly without damage

C. Tendons are inelastic and overstretching can cause rupture

D. Tendons are elastic but only in young individuals

Answer: (C)

Explicación

Tendons are inelastic structures with low elasticity. Overstretching beyond their elastic limit can cause partial or complete rupture, which is why they are susceptible to injury if overstressed.

4. Which hierarchical structure of collagen is directly responsible for its tensile strength in tendons?

A. Fibrils

B. Triple helix

C. Fibers

D. Bundles

Answer: (A)

Explicación

Fibrils are assembled from collagen molecules and are the primary structural elements that provide tensile strength, organized into fibers and bundles for functional strength.

5. How does the organized collagen structure in tendons contribute to their function?

A. It enables tendons to transmit force efficiently from muscle to bone

B. It prevents tendons from transmitting force effectively

C. It allows tendons to store elastic energy during movement

D. It makes tendons highly flexible and stretchable

Answer: (A)

Explicación

The organized collagen structure in tendons, including fibrils, fibers, and bundles, provides high tensile strength and enables efficient force transmission from contracting muscles to bones, facilitating movement.

6. What distinguishes tendons from ligaments in terms of their biomechanical properties?

A. Tendons are more elastic than ligaments.

B. Tendons are inelastic and primarily transmit force, while ligaments are more elastic and stabilize joints.

C. Tendons connect bones to bones, while ligaments connect muscles to bones.

D. Tendons contain more cartilage than ligaments.

Answer: (B)

Explicación

Tendons are inelastic tissues that transmit force from muscle to bone, whereas ligaments are more elastic and connect bones to stabilize joints.

7. Which structure is NOT part of the hierarchical organization of collagen in tendons?

A. Fibrils

B. Fibers

C. Bundles

D. Elastin fibers

Answer: (D)

Explicación

Elastin fibers are not part of the collagen hierarchy; the hierarchy includes fibrils, fibers, and bundles, all composed mainly of collagen.

8. What is the main consequence of overstretching a tendon beyond its elastic limit?

A. Improved flexibility

B. Tendon hypertrophy

C. Rupture of collagen fibers

D. Strengthening of the tendon

Answer: (C)

Explicación

Overstretching tendons beyond their elastic limit can cause rupture of collagen fibers, risking injury and compromising tensile strength.

9. Which characteristic best describes the difference between tendons and cartilage?

A. Tendons are more elastic than cartilage.

B. Cartilage is more flexible and less tensile, designed for smooth joint surfaces.

C. Tendons are composed mainly of elastin, while cartilage is collagen-rich.

D. Cartilage connects muscles to bones, while tendons connect bones to bones.

Answer: (B)

Explicación

Cartilage is more flexible and compressible, serving as a smooth surface for joints, whereas tendons are primarily tensile structures connecting muscle to bone.