Rigor naturally releases because ___.     A. muscle fibers begin to decompose   B. the ATP has been fully depleted   C. the body has cooled down   D. embalming fluid has been injected

1. Calcium triggers the contraction of a muscle fiber. Where in the muscle fiber is this calcium stored? A. nucleus B. calcium vesicles C. sarcoplasmic reticulum D. Golgi apparatus E. mitochondria

1. Given these characteristics: Matrix composed almost entirely of extracellular collagen fibers. It is able to withstand great pulling forces. Which of the tissue is described? A. Adipose B. Cartilage С. Bone D. Dense connective tissue E. Loose connective tissue 2. According to Frank-Starling law of the heart, A. increased preload causes increased cardiac output. B. increased afterload causes increased cardiac output. C. decreased preload causes increased afterload. D. afterload influences cardiac output more than preload. E. cardiac output is not influenced by preload. 3. During ventricular diastole, pressure in the ventricles falls to large arteries is about mm Hg, while the pressure within the mm Hg. А. 120, 80 В. 80,120 С. 80,0 D. 0,80 Е. 40, 120 4. Whereas (a) reflex is most important for regulating mean arterial pressure on a short-term basis; And (b) mechanism is most important for regulating mean arterial pressure on a long-term basis. (a) A. baroreceptor B. chemoreceptor C.…

The stage of rigor when the LEAST fluid will be absorbed by the muscle tissues is:     A. primary flaccidity   B. during full firmness   C. after the release of rigor (secondary flaccidity)   D. none of the above

In sustained, moderate exercise, skeletal muscle is predominantly using ______________ as its energy source. a. amino acids b. glucagon c. fatty acids d. creatine phosphate

Which of the following statements relating to the developmental aspects of muscles is false? a. All muscle tissue types arise from myoblasts b. Skeletal muscles become amitotic while smooth muscles regenerate throughout life c. Sarcopenia begins by age 30 and is irreversible d. Body strength per unit muscle mass is the same in both sexes  e. none of the above   Which of the following structures is located in the head region of the thick filament myosin? a. actin binding site b. ATP binding site c. ATPase enzyme d. all of the above e. none of the above

Compared to fast twitch muscle fibers, slow-twitch fibers _____.    A are able to produce much greater force during contractions   B "have more myoglobin, more mitochondria, and greater endurance"   C "are lighter in color, wider in diameter, and receive less blood flow"   D cannot maintain contractions as long because they have fewer mitochondria