Prokaryotes are very simple organisms. Most prokaryotes are unicellular, and they do not possess nuclei or other membrane-bound organelles.

Eukaryotes are more complex than prokaryotes. These organisms can be unicellular or multicellular, and they do possess nuclei and other organelles.

In which of the following kingdoms are eukaryotes most likely to be found?

Is it considered muscle s ennervation if sympathetic fibers innervate the vessels within the muscle?

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

Many animals cannot sweat to maintain a stable body temperature. what is one other way animals can cool down?