What stimulates cardiac muscle to contract? O The conduction system. O Signals from the spinal cord. O Hormones and involuntary signals from the nervous system O Homones only

Answer for the Number 3 question . Thank you. no need for a long explanation.

Multiple Choice.

Please ASAP. Thank you.

Please ASAP. Thank you.

True or false 1. Cytochrome p450 is considered to be the “universal oxygenase” 2. In alzheimer’s and Parkinson’s diseases, there is hyperphosphorylation of tau that leads to the intracellular accumulation of tau in the form of neurofibrillary tangles.

Nursing question.Please Discuss the biosynthesis of epinephrine. Give one important medical use of epinephrine.?.

Please ASAP. Thanku. What is the effect of increasing the activity of HCN (Ih) channels on action potential firing rate?

True or False. To increase adherence, vancomycin should be administered via the PO route to treat cellulitis of the left leg.

Dear Expert. Thank you for your advice, which is good and helpful. I note that your answer is "when 3 binding sites have been occupied the activity of these receptors is maximum." However, I also note that for a similar question (see below) on α7 nicotinic Acetylcholine Receptor (nAChR) also gives the same answer, ie. at least 3 agonist binding sites should be occupied.  Another Question - "To maximize the activity of an α7 nAChR, how many agonist binding sites should be occupied." I understand that in α7 nAChR, binding to two sites is more effective and binding to three sites is most effective for activation. On the other hand, binding to four or five sites in the nAChRs of chromosome 7 speeds up desensitization more than activation. Therefore, to maximize the activity of an α7 nicotinic Acetylcholine Receptor (nAChR) is also "3 sites". Am I right?