What are the cell-to-cell contacts of the cardiac muscle fibers called?
A. Cardiac discs
B. T-tubules
C. Z discs
D. Sarcoplasmic reticulum
E. Intercalated discs
Answer: E
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During the relative refractory period of an action potential, a larger than normal stimulus is needed to cause another action potential. This is due to the fact that ________
A) the voltage gated potassium ion channels remain open long enough to hyperpolarize the axon membrane B) the membrane is now impermeable to all ions C) the sodium potassium pump will stop working during relative refractory D) the inactivation gates on voltage gated sodium ion channels are closed
Which tonsils are located near the posterior opening of the nasal cavity?
a. pharyngeal tonsils b. palatine tonsils c. adenoids d. both A and C above
When the gains via input for a substance exceed its losses via output, a positive balance exists
a. True b. False Indicate whether the statement is true or false
Predict the type of connective tissue needed in an organ that needs to repeatedly expand and return to its original shape
A) Elastic connective tissue B) Dense irregular connective tissue C) Loose connective tissue D) Adipose tissue