What component of the cardiac conduction system distributes electrical signals directly through the papillary muscles

How do chloroplasts set plants apart from other living things

Sara goes on a slingshot ride in an amusement park. she is strapped into a spherical ball that has a radius 3*10^2 of centimeters. what is the volume of air in the spherical ball? use this formula: volume of a sphere=4/3pi,r^3 , where r is the sphere’s radius.

What are the responsibilities of the region of the brain highlighted below? =+= will rate brainiest =+=