You are part of a research group experimenting with signaling molecules that would tell cancer cells to stop dividing. the cancer cells have inactive receptors on their plasma membrane so you need an alternate method of getting the signals into the cells. what could you use?
a. gap junctions for direct contact.
b. through the synaptic cleft of a neuron.
c. plasmodesmata for direct contact.
d. stimulate the pituitary gland to send the signal as a hormone.

the oxygenated blood then leaves the lungs through pulmonary veins, which return it to the left heart, completing the pulmonary cycle. this blood then enters the left atrium, which pumps it through the mitral valve into the left ventricle. from the left ventricle, the blood passes through the aortic valve to the aorta.

deoxygenated blood leaves through the right ventricle through the pulmonary artery. from the right atrium, the blood is pumped through the tricuspid valve (or right atrioventricular valve), into the right ventricle.

69 is the correct math for the amino acids