Although a school of fish cannot make images or play charades, they still swim in unison and this is particularly useful for confusing a predator. They warned of swimming through rather than over the structures to avoid the jellyfish. Explain how jellyfish attack and where, if any, is a safe place to touch them.

If a cell's main function is to produce proteins to be excreted, which organelles would you expect to be larger

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

Match the description of each organism to the appropriate category