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.
Answer:
I don't have space for the download can't you send screenshot
Answer:
The answer to your question is d) Metaphase ll
Explanation:
Metaphase ll is the second stage of Meiosis ll after Profase ll. During this phase, chromosomes align along a single plane in the center of the cell. As we can see in your picture.
During this phase, the chromosomes are preparing themselves to be divided in the next phase (Anaphase ll).
B. <span>The mass increases as it changes from a liquid to a solid.</span>
