If the pacemaker cells in the SA node become more permeable to potassium ions, the
A) heart rate will increase.
B) heart rate will decrease.
C) cells will depolarize.
D) cells will hyperpolarize.
E) heart rate will decrease and cells will hyperpolarize.
E
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Brain blood flow autoregulation ________
A) is less sensitive to pH than to a decreased oxygen level B) is controlled by cardiac centers in the pons C) is abolished when abnormally high CO2 levels persist D) causes constriction of cerebral blood vessels in response to a drop in systemic blood pressure
The anatomical dead space is greatest in which of the following situations?
A. After waking up from a long nap B. After watching TV for an hour C. After swerving to narrowly avoid an accident while driving D. After eating a large meal
The term used to describe fluid collecting in the pericardial cavity that restricts the movement of the heart is known as
A) cardiac tamponade. B) mitral valve prolapse. C) pleural effusion. D) cardiomyopathy. E) pericarditis.
How many eggs can one hen produce a year?
a. 200 c. 400 b. 300 d. 500