The heart beats without extrinsic stimulation from the autonomic nervoussystem. True or False

Which is most involved in circadian rhythm The gracile fadciculus The medial lemniscus The para ventricular nucleus The sapracharismatic nucleus

If you have a resting heart rate of 125 beats/min or bpm then you have: a normal heart rate, bradycardia, or tachycardia

Which term and events apply to a chamber of the heart that is in Systole Contracting;filling with blood Relaxing;filling with blood Relaxing ;ejecting blood Contracting;ejecting blood

True or False: All types of blood vessels have smooth muscle? True False Previous

Activation of what adrenergic receptor directly causes stimulation of the heart? C-1 C-2 OB-1 O B-2

which part of the brain is affected when heart rate increases during exercise

Select the correct answer for each question.  Explain why you chose that answer as opposed to the others.  In other words, explain why the other choices are incorrect. The plateau phase of an action potential in cardiac muscle cells is due to the _____. Efflux of K+ through K+ channels Efflux of Ca2+ through fast Ca2+ channels Influx of Ca2+ through slow Ca2+ channels Influx of Na+ through fast Na+ channels

stroke - physiological system involved

Baroreceptor reflex-mediated increases in sympathetic activity causes vasodilation, bringing elevated blood pressure back to normal. True or False True False