What is the significance of the change in permeability of the sarcolemma in muscle contraction?
A) This change is caused by the displacement of actin and myosin molecules.
B) This change is caused by a neurotransmitter.
C) It has no role, because this phenomenon does not occur.
D) It causes the release of calcium ions.
E) None of the answers are correct.
D) It causes the release of calcium ions.
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Which elements of the cytoskeleton help maintain the shape of the cells, move organelles around, and aid in cell division?
A. Cilia B. Intermediate fibers C. Actin filaments D. Microtubules
The central region of the adrenal gland is the adrenal ________.
Fill in the blank(s) with the appropriate word(s).
Poiseuille determined the relationship between the resistance in a vessel to several variables. Which statement is TRUE about these relationships?
A. Resistance is proportional to the radius of the vessel raised to the 4th power, the viscosity of the fluid in the vessel, and the length of the vessel. B. Resistance is proportional to the radius of the vessel raised to the 4th power, the length of the vessel, and is inversely proportional to the viscosity of the fluid in the vessel. C. Resistance is proportional to the length of the vessel, the viscosity of the fluid in the vessel, and is inversely proportional to the radius of the vessel raised to the 4th power. D. Resistance is proportional to the radius of the vessel raised to the 4th power, the viscosity of the fluid in the vessel, and is inversely proportional to the length of the vessel.
The human genome consists of approximately 3.2 billion base pairs. Protein-coding genes represent ________ of the total genome.
A) 25 B) 10 C) 2 D) 50 E) 99