Place the following events in the correct sequence in which they occur: excitation-contraction coupling, electrical excitation of the muscle cell membrane, sliding of the myofilaments
A) excitation-contraction coupling, sliding of myofilaments, electrical excitation of the muscle cell membrane
B) sliding of the myofilaments, electrical excitation of the muscle cell membrane, excitation-contraction coupling
C) electrical excitation of the muscle cell membrane, sliding of the myofilaments, excitation-contraction coupling
D) electrical excitation of the muscle cell membrane, excitation-contraction coupling, sliding of the myofilaments
Answer: D
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Hyperventilation of the brain-injured patient:
A) shunts oxygen away from the brain and may result in decreased cerebral perfusion pressure. B) has clearly demonstrated decreased mortality and morbidity in patients with a severe head injury. C) causes cerebral vasodilation with increased intracranial pressure and should be avoided. D) is only appropriate if the patient is unresponsive and has bilaterally dilated and sluggishly reactive pupils.
Which statement is true concerning the genetic code?
A)DNA is said to specify only the structure of protein. B)The chemical structure of cells is primarily determined by lipids while the physical nature of cells is determined by proteins. C)DNA serves as the master blueprint for the synthesis of carbohydrates, lipids and proteins. D)Protein synthesis plays a small but important part in the metabolic machinery of the cell
Your patient has a build-up of urea in her body. Which of the following statements most likely explains this problem?
A) Protein metabolism is inefficient. B) Bile can no longer be manufactured. C) The kidney is overly active. D) The liver is no longer producing clotting factors.
Explain the term dynamic steady state.
What will be an ideal response?