A muscle cramp is a sudden, painful contraction of a muscle, during which movement is difficult. What is happening at the cellular level during a muscle cramp?
OA
The proteins in the myofibrils become denatured, preventing relaxation.
B.
Myosin and actin do not fully detach, so the muscle cannot relax.
O C.
The motor neuron does not send a signal, so the muscle cannot relax.
OD
A lack of calcium causes the sarcomeres to lock together, preventing relaxation.

dang that balls went far

i had this question and the answer was 3.15 miles.

martina travels from school to her mom's office. from there, she walks to school. after school, she walks to the library and then to a friends house before finally ending back at home. find martina's total distance traveled.

a) 0 miles  

b) 0.4 miles  

c) 1 mile  

d) 3.15 miles

the temperature in kelvin of 2.0 dm3 of an ideal gas is doubled and its pressure is increased by a factor of four. what is the final volume of the gas