The chamber of the heart forming the apex is the right atrium.
Answer the following statement true (T) or false (F)
False
Rationale: The chamber of the heart forming the apex is the left ventricle.
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When exposed to ultraviolet light, keratinocytes convert a steroid precursor into ________, a molecule that is crucial for regulation of calcium levels
A. calcitriol B. cholecalciferol C. calcitonin D. creatine E. phosphorus
The hypothalamus does NOT ________.
A. control body temperature B. control reactions to odors C. controls the autonomic nervous system D. control hunger and thirst
The sarcoplasmic reticulum
A. stores calcium ions. B. shortens during muscle contraction. C. transmits nerve impulses to the myofibrils. D. connects adjacent sarcomeres. E. covers the muscle fiber.
In smooth muscle, cross-bridging occurs due to
A. calcium binding to troponin. B. calcium binding to calmodulin. C. myosin kinase adding a phosphate to myosin heads. D. both calcium binding to troponin and calmodulin. E. both calcium binding to calmodulin and myosin kinase adding a phosphate to myosin heads.