Which of the following statements is NOT true?
a. Smooth muscle can be classified according to the timing and means of increasing cytosolic Ca2+.
b. In smooth muscle, C-type Ca2+ channels regulate the influx of extracellular Ca2+.
c. Smooth muscle tone exists because the muscle has a relatively low resting potential.
d. In smooth muscle, Ca2+ binds directly to myosin light chain kinase as opposed to troponin as it does in skeletal muscle.
e. Skeletal, cardiac, and smooth muscle differ in the energy source used for contraction.
D
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The glandular tissue of the breast consists of separate lobes, each containing several secretory
A) sinuses. B) lobules. C) alveoli. D) areolae. E) papillae.
A membrane permeable only to Na+ separates two compartments containing Na2SO4 as shown below
Electrodes are placed in both compartments and a voltage applied (compartment A is held at 0 mV). What voltage applied to compartment B would result in NO net movement of Na+ across the membrane separating the compartments? A. –60 mV B. –30 mV C. 0 mV D. +30 mV E. +60 mV
If someone sustained damage to the left side of their spinal cord at the T2 level such that both the anterolateral pathway and the posterior funiculus were severed on the left side only, what sensory deficits would exist in the left and right lower limbs?
What will be an ideal response?
Compare F-actin with G-actin
A) F actin is a twisted strand made up of two rows of G actin subunits where myosin heads can bind. B) G actin is a twisted strand made up of two rows of F actin subunits where myosin heads can bind. C) F actin binds myosin during muscle relaxation and G actin binds myosin during muscle contraction. D) F actin binds myosin during muscle contraction and G actin binds myosin during muscle relaxation. E) F actin is functional actin that contains myosin binding sites and G actin covers the binding sites on F actin to prevent actin-myosin interaction.