Which of the following sequence is correct regarding the cycle of structural changes used by myosin II to walk along an actin filament?

TLS Online TPP Program

#Question id: 12215

#Unit 7. System Physiology – Animal

Damage to the gastric mucosal barrier is a forerunner of gastric ulcer. Which of the following can both damage the gastric mucosal barrier and stimulate gastric acid secretion?

TLS Online TPP Program

#Question id: 12216

#Unit 7. System Physiology – Animal

Gastric emptying is regulated to ensure the chyme enters the duodenum at an appropriate rate. Which of the following factors promotes gastric emptying?

TLS Online TPP Program

#Question id: 12217

#Unit 7. System Physiology – Animal

Cystic fibrosis is the most common cause of pancreatitis in children. Which of the following best explains the mechanism of cystic fibrosis–induced pancreatitis?

TLS Online TPP Program

#Question id: 12218

#Unit 7. System Physiology – Animal

The control of gastric acid secretion in response to a meal involves several events that take place over a 4- or 5-hr period following the meal. These events include

(1) a decrease in the pH of the gastric contents,

(2) an increase in the rate of acid secretion,

(3) a decrease in the rate of acid secretion, and

(4) an increase in the pH of the gastric contents. Which of the following best describes

the correct temporal order of events over a 4- or 5-hr period following a meal?

TLS Online TPP Program

#Question id: 12219

#Unit 7. System Physiology – Animal

When the dietary intake of K+ increases, body K+ balance is maintained by an increase in K+ excretion primarily by which of the following?

TLS Online TPP Program

#Question id: 12220

#Unit 7. System Physiology – Animal

A female patient has unexplained severe hypernatremia (plasma Na+ = 167 mmol/L) and complains of frequent urination and large urine volumes. A urine specimen reveals that the Na+ concentration is 15mmol/L (very low) and the osmolarity is 155 mOsm/L (very low). Laboratory tests reveal: plasma renin activity = 3 ng angiotensin I/ml/hr (normal = 1.0), plasma antidiuretic hormone (ADH) = 30 pg/ml (normal = 3 pg/ml), and plasma aldosterone = 20 ng/dL (normal = 6 ng/dL). Which of the following is the most likely reason for her hypernatremia?