Fasciculins are toxic compounds found in the venom of snakes such as the cobra and mamba. The toxin causes one pre-synaptic action potential to produce multiple post-synaptic action potentials which results involuntary and prolonged contractions of muscles and paralysis. Based on this description, fasciculin toxins most likely inhibits the function of .

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

Amale bird-of-paradise uses a dance to attract mates in which it flaps its tail feathers on the ground and jumps around a potential female mate. a different male bird-of-paradise does a similar dance but it jumps around the female in the opposite direction. the female bird is only attracted to one style of dance, in one direction. this is an example of speciation.

The negative change found inside the plasma membrane is created by potassium ions sodium ions hydrogen ions chlorine ions