Indicate the location of each of the following in cardiac contractile cells. Voltage-gated Na+ channelsand Na4-Ca+* antiporter Ca+4-ATPase pump RYR channels Na+-K+-ATPase L-type Ca++ channels 1. T-tubules 2. Sarcolemma 3. Sarcoplasmic reticulum

Asolid cylinder is concentric with a straight pipe. the cylinder is 0.5 m long and has an outside diameter of 8 cm. the pipe has an inside diameter of 8.5 cm. the annulus between the cylinder ad the pipe contains stationary oil. the oil has a specific gravity of 0.92 and a kinematic viscosity of 5.57 x 10-4 m2/s. most nearly, what is the force needed to move the cylinder along the pipe at a constant velocity of 1 m/s?