Complete the Concept Map to describe ionic movement during action potentials in cardiac pacemaker and contractile cells, and trace the conduction pathway. Drag the appropriate labels to their respective targets. AV nodes, bundles, branches, and Purkinje fibers -are specifically made of → directly trigger atria to contract and activate Ca2+ ions directly trigger ventricles to contract and activate cardiac muscle fibers enter plateau phase due to slow influx of K ions rapidly depolarize due to influx of Na ions pacemaker cells -repolarize due to efflux of → slowly depolarize due to influx of SA nodes

science-ocean floors and habitats study guide by volleyballqueen3817 a major advance in ocean-floor mapping. list four sections of the ocean floor. algae that use sunlight to produce their own food through photosynthesis. all of the feeding relationships that exist in a habitat. drying out, predators, find food.

it’s lava came from an explosive eruption

genetic variation can be caused by mutation (which can create entirely new alleles in a population), random mating, random fertilization, and recombination between homologous chromosomes during meiosis (which reshuffles alleles within an organism's offspring).

the electromagnetic energy from the sun arrives in the form of visible and invisible light.