Place the events in the correct sequence. not all items will be used.
a) neurotransmitter crosses synaptic cleft
b) neurotransmitter attaches to receptors on a muscle, neuron, or gland cell
c) calcium leaves the synaptic knob
d) neurotransmitter enters synaptic knob by endocytosis
e) voltage-gated calcium channels open
f) calcium enters the synaptic knob
g) synaptic vesicles merge with synaptic knob plasma membrane
h) neurotransmitter is released by exocytosis
i) action potential reaches synaptic knob

Dwarf galaxies are select one: a. relatively rare. b. not very bright c. mostly spiral shaped. d. none of these.

What is the difference between the conducting zone and the respiratory zone of the respiratory system? the conducting zone is a series of cavities and tubes that move air to the respiratory zone where gases exchange with the bloodstream. the conducting zone exchanges gases between the lungs and the alveoli and the respiratory zone is a series of cavities and tubes that move air to the conducting zone. the conducting zone moves oxygen into the cells and the respiratory zone takes carbon dioxide away from the cells. the conducting zone moves oxygen into the bloodstream and the respiratory zone takes carbon dioxide away from the bloodstream.

Which of the following are not included as modern mammals that evolved during the eocene epoch? primates artiodactyls perissodactyls none of the above