Andromeda is the nearest galaxy that 2.5 million light years away from earth.
Answer:
Christian's who left home to convert foreign people to christianity
Explanation:
it was there mission
Answer:
The correct answer is: β1 adrenergic receptor activation. Increased in cAMP lead to increased amounts of Na influx (though if channels) and calcium influx of pacemaker cells. This increases the frequency of APs of the pacemaker and increases the rate of contraction.
Explanation:
cAMP generated in response to β1 adrenergic receptors,results in excitation contraction coupling by initiating PKA and causing phosphorylation of L type Ca2+ channels and ryanodine receptors. This increases the concentration of intracellular Ca2+ ions in atrial cells, ventricular cells and AV pacemaker cells. This increase in firing rate. As a result rate of contraction increases.
D. is the correct answer. It uses neurons to signal.
Molecules diffuse across the plasma membrane with assistance from membrane proteins, such as channels and carriers.
