Hole's Human Anatomy & Physiology (Shier), 12th Edition

Ph.I.L.S. 3.0 Quizzing 25: Ph.I.L.S. 3.0 Quizzing

Ph.I.L.S. 3.0 Quizzing

1
Look at your data. What does cooling do to heart rate?
A)Cooling increases the heart rate.
B)Cooling does not change the heart rate.
C)Cooling decreases the heart rate.
2
Where is the pacemaker for the normal healthy heart?
A)The sinoatrial (SA) node.
B)The atrioventricular (AV) node.
C)The atrioventricular (AV) bundle or bundle of His.
D)The Purkinje fibers.
3
What is the effect of cooling on the rate of enzymic action?
A)Cooling decreases the rate of enzymic action.
B)Cooling does not change the rate of enzymic action.
C)Cooling increases the rate of enzymic action.
4
Ion channels and enzymes are both proteins. If cooling decreases the rate of enzymic activity, what does cooling do to the rate that channels open and close?
A)Cooling increases the rate that channels open and close, and slows pacemaker activity and the heart rate.
B)Cooling does not change the rate that channels open and close, slowing pacemaker activity and heart rate.
C)Cooling decreases the rate that channels open and close, and slows pacemaker activity and the heart rate.
5
Acetylcholine is secreted onto the heart by the parasympathetic nervous system. Look at your data. What does acetylcholine do to heart rate?
A)Acetylcholine increases the heart rate.
B)Acetylcholine does not change the heart rate.
C)Acetylcholine decreases the heart rate.
6
Acetylcholine opens potassium channels in the membrane of the pacemaker cells. In this way, acetylcholine hyperpolarizes the membrane, which:
A)moves it closer to threshold so that action potentials (and heart contractions) take place at a faster rate.
B)does not change relative to threshold, so has no effect on action potential production and heart contractions.
C)moves it further from threshold so that action potentials (and heart contractions) take place at a slower rate.
7
Acetylcholine decreases cardiac output so that blood enters the arteries at a slower rate. If the rate of arterial blood loss is constant, what would acetylcholine do to blood pressure?
A)Acetylcholine would increase blood pressure.
B)Acetylcholine would decrease blood pressure.
C)Acetylcholine would have no effect on blood pressure.
8
Adrenalin is secreted onto the heart by the sympathetic nervous system. Look at your data. What does adrenalin do to heart rate?
A)Adrenalin increases the heart rate.
B)Adrenalin does not change the heart rate.
C)Adrenalin decreases the heart rate.
9
What is the effect of adrenalin on amplitude of each contraction and the cardiac output?
A)The contraction amplitude decreased and the cardiac output increased.
B)The contraction amplitude decreased and the cardiac output decreased.
C)The contraction amplitude increased and the cardiac output increased.
D)The contraction amplitude increased and the cardiac output decreased.
10
Adrenalin increases the rate at which blood enters the arteries. If the rate of blood loss from the arterial system remains constant, what would adrenalin do to blood pressure?
A)Adrenalin would decrease blood pressure.
B)Adrenalin would have no effect on blood pressure.
C)Adrenalin would increase blood pressure.
Glencoe Online Learning CenterScience HomeProduct InfoSite MapContact Us

The McGraw-Hill CompaniesGlencoe

Please read our Terms of Use and Privacy Notice before you explore our Web site. To report a technical problem with this Web site, please contact the Web Producer.