APPLIED RADIOLOGICAL ANATOMY

ANATOMY

MUSCULOSKELETAL AND SOFT TISSUE

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Characteristic of muscle that is the same as flexing
A
contractibility
B
excitability
C
extensibility
D
elasticity
Explanation: 

Detailed explanation-1: -Contractility is the ability of muscle cells to forcefully shorten. Contractility allows muscle tissue to pull on its attachment points and shorten with force. ( muscles can only pull, never push.) Excitability is the ability to respond to a stimulus, which may be delivered from a motor neuron or a hormone.

Detailed explanation-2: -(1) Large fibers for great strength of con-traction. (2) Extensive sarcoplasmic reticulum for rapid release of calcium ions to initiate contraction. (3) Large amounts of glycolytic enzymes for rapid release of energy by the glycolytic process.

Detailed explanation-3: -In a concentric contraction, the force generated by the muscle is less than the muscle’s maximum, and the muscle begins to shorten. This type of contraction is widely known as muscle contraction.

Detailed explanation-4: -Both calcium & magnesium are required for muscle contraction. Calcium binds to troponin which exposes the active sites on actin. Now myosin head can bind the active sites on actin, initiating the process of muscle contraction. The hydrolysis of ATP is used to provide energy for muscle contraction.

There is 1 question to complete.