DPT 540: STRETCHING EXAM QUESTIONS AND
ANSWERS WITH COMPLETE SOLUTIONS GRADED A++
What is being stretched?
Contractile (mm fibers/cells) and non-contractile tissues (CT and Neural innervation of
contractile tissue)
What is Connective Tissue?
Ligaments, tendons, joint capsules, fascia, noncontractile tissue in muscles and skin
What is the composition of CT?
Collagen fibers, Elastin Fibers, reticulin, nonfibrous ground substance
Describe collagen fibers
- Provides stability
- Responsible for the strength and stiffness (tendons)
Describe elastin fibers
Provide extensibility (elongation with small loads) (walls of arteries, lungs, intestines,
skin)
Describe reticulin
Provide tissue with bulk
describe nonfibrous ground substance
-Organic gel containing water, proteoglycans (PGs) and glycoproteins
-Reduces friction and transports nutrients
, (cartilage and intervertebral discs)
If there is more collagen in fibers then
increased stability
if there is more elastin in fibers =
increased flexibility
how much stronger is collagen than elastin
5X
Describe the alignment and function of collagen fibers in tendons
collagen fibers are parallel and resistant to most tensile load
Describe the alignment and functions of collagen fibers in skin
random and do not resist tensile load well
describe the alignment of collagen fibers in ligaments, fasciae, and joint capsules
orientation varies
What does the ground substance contain and resist?
Proportion of proteoglycans and resist higher compressive forces (intervertebral discs)
Describe the stress-strain curve
Illustrates the strength properties, stiffness, and amount of energy the material can store
before failure of the structure
Define stress
force (or load) per unit area
What are the 3 kinds of stress that develop in a response to applied load
tension, compression and shear
ANSWERS WITH COMPLETE SOLUTIONS GRADED A++
What is being stretched?
Contractile (mm fibers/cells) and non-contractile tissues (CT and Neural innervation of
contractile tissue)
What is Connective Tissue?
Ligaments, tendons, joint capsules, fascia, noncontractile tissue in muscles and skin
What is the composition of CT?
Collagen fibers, Elastin Fibers, reticulin, nonfibrous ground substance
Describe collagen fibers
- Provides stability
- Responsible for the strength and stiffness (tendons)
Describe elastin fibers
Provide extensibility (elongation with small loads) (walls of arteries, lungs, intestines,
skin)
Describe reticulin
Provide tissue with bulk
describe nonfibrous ground substance
-Organic gel containing water, proteoglycans (PGs) and glycoproteins
-Reduces friction and transports nutrients
, (cartilage and intervertebral discs)
If there is more collagen in fibers then
increased stability
if there is more elastin in fibers =
increased flexibility
how much stronger is collagen than elastin
5X
Describe the alignment and function of collagen fibers in tendons
collagen fibers are parallel and resistant to most tensile load
Describe the alignment and functions of collagen fibers in skin
random and do not resist tensile load well
describe the alignment of collagen fibers in ligaments, fasciae, and joint capsules
orientation varies
What does the ground substance contain and resist?
Proportion of proteoglycans and resist higher compressive forces (intervertebral discs)
Describe the stress-strain curve
Illustrates the strength properties, stiffness, and amount of energy the material can store
before failure of the structure
Define stress
force (or load) per unit area
What are the 3 kinds of stress that develop in a response to applied load
tension, compression and shear
