Rigor mortis occurs following death because
a. tropomyosin remains over the myosin binding sites of actin.
b. myosin heads attach to actin and are not released due to lack of ATP.
c. the myosin becomes misshapen.
d. all of the Ca2+ remains within the sarcoplasmic reticulum.
b. myosin heads attach to actin and are not released due to lack of ATP.
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The pharynx serves as a common passageway for the digestive and respiratory tracts, and is lined with a keratinized epithelium to protect against abrasion.
Answer the following statement true (T) or false (F)
All but one of the following is a function of the low pH found in the stomach. Select the description below that does not reflect a role of stomach acid
A) The stomach's acid catabolically breaks down food stuffs in preparation for absorption. B) Stomach acid denatures proteins making the poly peptide chain more accessible to pepsin digestive enzymes. C) Many potentially harmful bacteria will be prevented entry to the small intestine by stomach acid. D) Low pH converts pepsinogen to its active form of pepsin, preventing the protease enzyme from digesting the cells that produce it.
Which head of the quadriceps femoris extends the knee and flexes the thigh at the hip?
A. Biceps femoris B. Vastus intermedius C. Rectus femoris D. Vastus lateralis E. Vastus medialis
What functional brain system participates in memory, learning, emotion, and behavior?
A) medial lemniscal system B) anterolateral system C) limbic system D) peripheral nervous system