A muscle ________ contains a sarcolemma, sarcoplasm, myofilaments, and myofibrils.
A) fiber
B) intercalated disc
C) T-tubule
D) myofibril
E) motor end plate
A) fiber
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A patient is in the emergency room for a severe anxiety attack. Their doctor administers a dose of potassium to control their elevated heart rate. Why would potassium potentially be a treatment for the cardiovascular effects of an anxiety attack?
A. Excess potassium ion concentration causes decreased rate and decreased force of contraction. B. Excess potassium ion concentration directly signals the sympathetic nervous system to cease signaling to increase heart rate C. Excess potassium ion concentration causes decreased rate and increased force of contraction. D. Excess potassium ion concentration signals the parasympathetic nervous system directly to lower heart rate
Which of the following is absorbed by secondary active transport?
a. glucose b. galactose c. amino acids d. glucose and amino acids e. all of these
What are the ciliated CNS neuroglia cells that play an active role in the production of cerebrospinal fluid?
A) ependymal cells B) astrocytes C) oligodendrocytes D) microglia
The two-neuron chain allows increased communication and control of the effector organ.
Indicate whether the statement is true or false.