In an EKG of a normal cardiac rhythm, the P wave and T wave (respectively) indicate __________________ and ___________________
Fill in the blank with correct words.
Answer: Atrial depolarization; ventricular repolarization
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The cutaneous plexus is
A) a network of nerves in the cutaneous membrane. B) a superficial network of dermal arteries. C) a deep network of dermal arteries along the boundary of the reticular layer. D) a neural plexus responsible for deep pressure. E) a network of arteries in the epidermis.
Which of the following statements about ATP is false?
A) ATP drives the transport of certain solutes (e.g., amino acids) across cell membranes. B) ATP activates contractile proteins in muscle cells so that cells can shorten and perform mechanical work. C) ATP provides the energy needed to drive energy-absorbing chemical reactions. D) ATP is a modified nucleotide. E) The phosphate groups of ATP are attached by high-energy hydrogen bonds.
During reabsorption in the proximal convoluted tubule, most of the amino acids, glucose, Na+ ions, K+ ions, and Ca2+ ions are removed from the tubular fluid by ________ mechanisms.
A. passive transport B. counter transport C. active transport D. osmotic
For an action potential to be generated the signal must be strong enough at the axon hillock to bring the membrane voltage to a critical value called the THRESHOLD. The threshold value is typically at