What happens to the actin and myosin during a muscle contraction

Asample of radium-226 will decay 1/4 of its original amount after 3200years. what is the half-life of radium-226?

Match term definition ellipse a) diagonal cross section of a cylinder circle b) diagonal cross section through the widest part of a sphere sphere c) cross section parallel to the base of a cone great circle d) shape created when a semi-circle is rotated around the y-axis triangle e) perpendicular cross section of a cone

Predict the products butane (c4h10) + oxygen —>