Chapter 12b. Muscles. Summation of Contractions. Figure 12-17a. Summation of Contractions. Figure 12-17b. Summation of Contractions. Figure 12-17c. Summation of Contractions. Figure 12-17d. Motor Units. One muscle may have many motor units of different fiber types. SPINAL CORD.
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One muscle may havemany motor units ofdifferent fiber types.
Motor unit 1
Motor unit 2
Motor unit 3
Interactive Physiology® Animation: Muscular System:Contraction of Motor Units
Schematic of the series elastic elements
Isotonic contraction:Sarcomeres shortenmore but, because elasticelements are alreadystretched, the entiremuscle must shorten.
Isometric contraction:Muscle has not shortened.Sarcomeres shorten, generatingforce, but elastic elementsstretch, allowing muscle lengthto remain the same.
F2 = 2 kg
A 7-kg load is addedto the hand 25 cmfrom the elbow.
(a) Single-unit smooth muscle cells