Explain how isometric and isotonic contractions differ, using examples of each
What will be an ideal response?
1. Isometric contractions are contractions in which the muscles do not shorten. The myofilaments are trying to slide, but the muscle is pitted against some more or less immovable object. For example, when you push the palms of your hands together in front of you, your arm and chest muscles are contracting isometrically.
2. Isotonic contractions occur due to the successful sliding of the myofilaments. The muscle shortens and movement occurs. Bending the knee, lifting weights, and smiling are all examples of isotonic contractions.
You might also like to view...
"Somatosensory" does not refer to sensory signals from ________.
A. proprioceptors B. the skin C. bones and muscles D. joints E. the viscera
Cytokinesis usually begins before ________ ends
A. prophase B. interphase C. metaphase D. anaphase E. telophase
Changes in the radius of _____ has the most impact on resistance to blood flow, because radius can be changed quickly and precisely.
A. Capillaries B. Arteries C. Arterioles D. Venules
Which of the following is not an ascending tract?
A. Spinocerebellar B. Spinothalamic C. Gracile fasciculus D. Corticospinal E. Cuneate fasciculus