What are intercalated discs found in cardiac muscle cells?
A.) The portion of the sacrolemma that is found at the neuromuscular junction
B.) The functional unit for muscle contraction, like sacromeres in skeletal muscles
C.) A protein that binds oxygen in the cardiac muscle cell
D.) Complex membrane junctions that include desmosomes and gap junctions
Ans: B.) The functional unit for muscle contraction, like sacromeres in skeletal muscles
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Hypovitaminosis of vitamin B12 can cause pernicious anemia, however, hypervitaminosis can cause
A) polycythemia. B) possible lethal CNS alterations. C) hypotension. D) kidney stones. E) itching and tingling sensations.
Choose the correct statement regarding the structure of the plasma membrane.
A. The hydrophobic center of the plasma membrane will restrict the movement of fat-soluble substances through the membrane. B. The membrane is composed of water-soluble molecules, to allow movement of water between the fluid compartments. C. The movement of proteins in the plasma membrane allows for cellular adaptations to the extracellular environment. D. Carbohydrates in the plasma membrane can serve as a source of immediate energy for the cell.
Which structure contains nuclei that regulate body temperature, food intake, and sexual response?
A. Thalamus B. Hypothalamus C. Midbrain D. Pons E. Medulla oblongata