What is the difference between white and gray matter on the spinal cord

Specialized cells which perform a particular function form : organisms organs tissues

Guard cells control which event? the growth of plants capture of solar energy gas exchange in leaves water absorption in roots

Define the apical impulse and describe its normal location, size, and duration. which abnormal conditions may affect the location of the apical impulse? explain the mechanism producing normal first and second heart sounds. describe the effect of respiration on the heart sounds. describe the characteristics of the first heart sound and its intensity at the apex of the heart and at the base. describe the characteristics of the second heart sound and its intensity at the apex of the heart and at the base.