31 Suppose a drug blocks entry of calcium from the extracellular fluid. What if, anything, would happen to the force of skeletal muscle or smooth muscle contraction if youstimulated them to contract under these conditions (as compared to normal)skeletal: unable to contract; smooth: no changeskeletal: decreased, but still contracts; smooth: decreased, but still contractsskeletal: decreased, but still contracts; smooth: unable to contractskeletal: no change in force; smooth: decreased, but still contractsskeletal: no change in force; smooth: unable to contract

Muscle cells are specialized cells that use contractile motion for movement either voluntary or involuntary in various tissues. They form fibers called myofibrils that ultimately form the muscle tissue. Muscle cells are basically of three types, skeletal, smooth and cardiac muscle cells, each of which have different tissue specific properties. Answer : First option - Skeletal-unable to contract, smooth-no change. Explanation -: Calcium is needed by Skeletal muscles to facilitate cross bridge formation between actin and myosin by removing troponin, hence in absence of this no cross bridge formation occurs. Which means no contraction and hence, no generation of force. Smooth muscles on the other hand require calcium only for maintaining ionic balance and hence, aren't much affected.If calcium intake into a skeletal muscle cell is completely stopped, no crossbridge formation between the opertaing proteins occurs. So, the contraction does not just decrease, but it completely stops. So, second and third options are incorrect. Skeletal muscles will definitely show change in contractile force when calcium is not available. So, the fourth and the fifth options are also incorrect.So, due to the drug, the changes in contraction forces would be skeletal : unable to contract; smooth : no change.