More questions only 1 hour HELP

Atrial natriuretic peptide
 A.lowers blood pressure.
 B.reduces loss of sodium in the urine.
 C.is a neurotransmitter released by the ANS.

 D.increases blood voume.

Systolic pressure is the pressure in the arteries when the ventricles are contracting, while diastolic pressure is the pressure in blood vessels when the ventricles are relaxed.
 True
 False


Excessive vagal stimulation of the heart will result in _______.
 A.a decrease in the force of contraction   
 B.a decrease in heart rate and, eventually, a temporary cessation of the heartbeat   
 C.an increase in the force of contraction   
 D.an increase in heart rate

Research shows that in the absence of neural and hormonal influences, the sinoatrial (SA) node generates action potentials at a frequency of about 100 times per minute. However, the resting heart rate is about 70 beats per minute. What would the approximate heart rate be if the vagus nerve were
severed?
 A.faster than 100 beats per minute   
 B.about 70 beats per minute   
 C.about 100 beats per minute   
 D.slower than 70 beats per minute

In the simulation, delivering single shocks in succession to stimulate the frog heart _______.
 A.resulted in fused tetanus   
 B.resulted in wave summation   
 C.did not increase the height of the ventricular systole wave   
 D.increased the height of the ventricular systole wave
The effect of vagus nerve stimulation on the heart is to _______.
 A.decrease the heart rate   
 B.increase the heart rate   
 C.increase the heart rate and increase the force of contraction   
 D.decrease the heart rate and decrease the force of contraction   
The effect of the parasympathetic nervous system on the heart is to _______.
 A.decrease the heart rate   
 B.increase the heart rate   
 C.increase the heart rate and increase the force of contraction   
 D.decrease the heart rate and decrease the force of contraction   
What happens during Phase 2 of cardiac muscle depolarization?
 A.Membrane potential falls slightly and then rebounds as potassium flow out of the cell decreases and calcium flows into the cell.   
 B.Rapid upswing in membrane potential; sodium ions enter cardiac cell.   
 C.Period of resting potential until the next depolarization.   
 D."The plateau phase"; when the membrane remains in a depolarized state; potassium channels stay closed and calcium channels stay open.

Which of the following types of muscle are capable of autorhythmicity?
 A.Cardiac and skeletal   
 B.Smooth   
 C.Cardiac   
 D.Skeletal   
 E.Cardiac and smooth   


   4.0 Points
You used a simulated frog heart in this exercise. How does the frog heart differ from the human heart?


Briefly explain what would happen to the heart rate if the vagus nerve was surgically cut.