100 point Which substances are contained in saliva and tears to break down pathogens? enzymes

acids

oils

sweat

Match the following terms describing electrical events with the correct phases of the cardiac cycle. the ventricular muscle cells depolarize at the start of this phase. during this phase, na+ entry through the funny channels causes the pacemaker potential of sa nodal cells to gradually become less negative until it reaches threshold. the ventricular muscle cells repolarize right before this phase. the cytosolic concentration of calcium in the contractile cells of the ventricle is highest during this phase. a. isovolumetric relaxation b. ventricular ejection c. isovolumetric contraction d. ventricular filling

Explain how the number of similarities between the embryos from early stage to late stage is used as evidence of a common ancestry

Which type of stimulus do mechanoreceptors detect? sound pain heat light