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Question
Where are the heart cells with the fastest rate of action potential initiation localized?a. apex of the heart
b. Purkinje fibers
c. Bundle of His
d. AV node
e. SA node
Answer
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Related questions
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Describe how hydrogen ion secretion impacts acid-base balance.
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Vasopressin is produced by several specific neuronal cell bodies in the __________ and then stored in the posterior __________ gland.
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The plasma clearance rate of a substance filtered, but not reabsorbed or secreted, always equals the __________.
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The micturition reflex is initiated when stretch receptors within the urethra are stimulated.
a. True
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a. True
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The plasma clearance rate for a secreted substance is always less than the glomerular filtration rate.
a. True
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Hydrogen ions are only secreted by the proximal tubules.
a. True
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Plasma protein concentration can become extremely high in diabetes mellitus, a digestive disorder involving inadequate insulin action.
a. True
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a. True
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The loop of Henle forms a sharp U-shaped or hairpin loop that surrounds the renal cortex.
a. True
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What does micturition mean?
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b. The process of filtration through the glomerulus
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d. The final filtration of urine
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Q:
What happens when the hydrogen ion concentration in the body fluids is too low?
a. Oxygen absorption increases.
b. Hydrogen absorption increases.
c. Hydrogen absorption decreases.
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e. Hydrogen secretion decreases.
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The most prevalent ions secreted by the tubules are:
a. sodium and chloride
b. sodium and hydrogen
c. sodium and potassium
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a. potassium
b. chloride
c. sodium
d. glucose
e. phosphorus
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How are glucose and amino acids reabsorbed in the proximal tubule?
a. primary passive transport
b. secondary passive transport
c. primary active transport
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What are the two major control mechanisms that regulate the glomerular filtration rate (GFR)?
a. internal regulation and intrinsic parasympathetic control
b. autoregulation and intrinsic sympathetic control
c. internal regulation and extrinsic parasympathetic control
d. autoregulation and extrinsic sympathetic control
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Gas exchange at both the pulmonary capillary and the tissue capillary levels involves simple __________ diffusion of O2 and CO2 down __________ pressure gradients.
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Emphysema is characterized by __________ of the smaller airways and breakdown of __________ walls.
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The major inspiratory musclesthe muscles that contract to accomplish an inspiration during quiet breathinginclude the __________ and __________ intercostal muscles.
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Inspiratory volume is the minimum volume of air remaining in the lungs even after a maximal expiration.
a. True
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a. True
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Beyond the larynx, the trachea divides into two main branches, the right and left bronchi.
a. True
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Hiccups occur when involuntary, spasmodic contractions take place in what muscle?
a. chest muscles
b. abdominal muscles
c. intercostal muscles
d. bronchioles
e. diaphragm
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Generation of respiratory rhythm is now known to lie in the:
a. medullary respiratory center
b. pneumotaxic center
c. respiratory modulator
d. pre-Btzinger complex
e. apneustic center
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The most important factor determining the percentage of hemoglobin saturation is the:
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c. pH of the blood
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