Major determinant of the resting membrane potential necessary for transmission of nerve impulses
Major determinant of the resting membrane potential necessary for transmission of nerve impulses
Permalink:
Question
Question 1
2 / 2 pts
What is a major determinant of the resting membrane potential necessary for transmission of nerve impulses?
The ratio between intracellular K+ and extracellular Na+
The ratio between intracellular Na+ and extracellular K+
The ratio between intracellular Na+ and extracellular sodium
The ratio between intracellular K+ and extracellular potassium
Question 2
2 / 2 pts
Chvostek sign and Trousseau sign indicate
hypercalcemia
hypokalemia
hyperkalemia
hypocalcemia
Question 3
2 / 2 pts
Physiologic pH is maintained around 74 because bicarbonate (HCO3) and carbonic acid (H2CO3) exist in a ratio of
1:20
10:2
10:5
20:1
Question 4
2 / 2 pts
Water movement between the intracellular fluid compartment and the extracellular compartment is primarily a function of
osmotic forces
antidiuretic hormone
hydrostatic forces
plasma oncotic pressure
Question 5
2 / 2 pts
Which are indications of dehydration?
Tachycardia and weight loss
Muscle weakness and decreased deep tendon reflexes
Polyuria and hyperventilation
Decreased hemoglobin and hematocrit
Question 6
2 / 2 pts
At the arterial end of capillaries, fluid moves from the intravascular space into the interstitial space because the
capillary oncotic pressure is lower than the interstitial hydrostatic pressure
capillary hydrostatic pressure is higher than the capillary oncotic pressure
interstitial hydrostatic pressure is higher than the capillary hydrostatic pressure
interstitial oncotic pressure is higher than the interstitial hydrostatic pressure
Question 7
2 / 2 pts
In hyperkalemia, cardiac rhythm changes are a direct result of
cardiac cell repolarization
depression of the sinoatrial (SA) node
cardiac cell hypopolarization
cardiac cell hyperexcitability
Question 8
2 / 2 pts
Clinical manifestations that include unexplained weight loss, dyspnea on exertion, use of accessory muscles, and tachypnea with prolonged expiration are indicative of
chronic bronchitis
pneumonia
asthma
emphysema
Question 9
2 / 2 pts
In ARDS, alveoli and respiratory bronchioles fill with fluid as a result of the
compression on the pores of Kohn, thus preventing collateral ventilation
inactivation of surfactant and the impairment of type II alveolar cells
increased capillary hydrostatic pressure that forces fluid into the alveoli and respiratory bronchioles
increased capillary permeability, which causes alveoli and respiratory bronchioles to fill with fluid
Question 10
2 / 2 pts
Pulmonary edema usually begins at a pulmonary capillary wedge pressure or left atrial pressure of _____ mm Hg
20
40
30
10
Question 11
2 / 2 pts
The most successful treatment for chronic asthma begins with
drugs that reduce bronchospasm
broad-spectrum antibiotics
elimination of the causative agent
drugs that decrease airway inflammation
Question 12
2 / 2 pts
High altitudes may produce hypoxemia through
decreased inspired oxygen
diffusion abnormalities
hypoventilation
shunting
Question 13
2 / 2 pts
Which pleural abnormality involves a site of pleural rupture that act as a one-way valve, permitting air to enter on inspiration but preventing its escape by closing during expiration?
Open pneumothorax
Secondary pneumothorax
Tension pneumothorax
Spontaneous pneumothorax
Question 14
2 / 2 pts
Clinical manifestations of pulmonary hypertension include
dyspnea on exertion and paroxysmal nocturnal dyspnea
productive cough and rhonchi bilaterally
peripheral edema and jugular venous distention
systemic blood pressure greater than 130/90
Question 15
2 / 2 pts
In tuberculosis, the body walls off the bacilli in a tubercle by stimulating which action?
macrophages that release TNF-alpha (TNF-α)
apoptotic infected macrophages that activate cytotoxic T cells
phagocytosis by neutrophils and eosinophils
formation of immunoglobulin G to initiate the complement cascade
Question 16
2 / 2 pts
A(n) _____ is a circumscribed area of suppuration and destruction of lung parenchyma
empyema
cavitation
consolidation
abscess
Question 17
2 / 2 pts
_____ is a fulminant form of respiratory failure characterized by acute lung inflammation and diffuse alveolocapillary injury
Pneumonia
Acute pulmonary edema
Pulmonary emboli
Acute respiratory distress syndrome (ARDS)
Question 18
0 / 2 pts
Dyspnea is not a result of
fatigue of the intercostal muscles and diaphragm
decreased pH, increased PaCO2, and decreased PaO2
stimulation of stretch or J-receptors
decreased blood flow to the medulla oblongata
Question 19
2 / 2 pts
The release of fibroblast growth factors affects ARDS by causing
disruption of alveolocapillary membrane
pulmonary fibrosis
pulmonary hypertension
atelectasis and decreased lung compliance
Question 20
2 / 2 pts
Which of the following types of croup is most common?
Autoimmune
Bacterial
Fungal
Viral
Question 21
2 / 2 pts
Chest wall compliance in infants is _____ in adults
unlike that
lower than
higher than
the same as
Question 22
2 / 2 pts
What is the primary cause of RDS of the newborn?
Anemia
An immature immune system
Small alveoli
A surfactant deficiency
Question 23
0 / 2 pts
Which of the following statements about the advances in the treatment of RDS of the newborn is incorrect?
Treatment includes the instillation of exogenous surfactant down an endotracheal tube of infants weighing less than 1,000 g
Administering glucocorticoids to women in preterm labor accelerates the maturation of the fetus’s lungs
Supporting the infant’s respiratory function by using continuous positive airway pressure (CPAP) An infant’s respiratory function is supported by using continuous pressure (CPAP)
Administering oxygen to mothers during preterm labor increases their arterial oxygen before birth of the fetus
Administration of oxygen to the mother is not a valid treatment of RDS
Question 24
2 / 2 pts
Which immunoglobulin is present in childhood asthma?
IgG
IgA
IgE
IgM
Included in the long list of asthma-associated genes are those that code for increased levels of immune and inflammatory mediators (eg, IL-4, IgE, and leukotrienes), nitric oxide, and transmembrane proteins in the endoplasmic reticulum
Question 25
2 / 2 pts
Cystic fibrosis (CF) is caused by a(n)
autosomal dominant inheritance
autosomal recessive inheritance
infection
malignancy
