_________ occurs when the external intercostal muscles contract, pulling the ribs up and expanding laterally.
Vital capacity
Expiration
Inspiration
Ventilation
The Correct Answer is C
A. Vital capacity: Vital capacity is a lung-volume measurement (maximum inhale → maximum exhale), not the mechanical action of rib elevation.
B. Expiration: Expiration (quiet) is produced by relaxation and elastic recoil; active rib elevation is not part of expiration.
C. Inspiration: Contraction of the external intercostals (and diaphragm) raises the ribs and expands the thoracic cage, producing inspiration.
D. Ventilation: Ventilation is the overall process of air movement in and out of the lungs; rib elevation specifically describes inspiration rather than the whole process.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is ["B","C","D","E"]
Explanation
A. Pepsin:Pepsin is an active protease produced in the stomach (from pepsinogen) -not a pancreatic secretion.
B. Sodium bicarbonate:The pancreas secretes bicarbonate-rich fluid to neutralize acidic chyme in the duodenum -pancreatic secretion .
C. Amylase: Pancreatic amylase digests starches into sugars in the small intestine -pancreatic secretion .
D. Nuclease:The pancreas secretes nucleases (e.g., deoxyribonuclease, ribonuclease) to digest nucleic acids -pancreatic secretion .
E. Lipase:Pancreatic lipase hydrolyzes triglycerides into free fatty acids and monoglycerides -pancreatic secretion .
F. Pepsinogen:Pepsinogen is secreted by chief cells in the stomach, not by the pancreas -not a pancreatic secretion.
Correct Answer is A
Explanation
A. Regulating body temperature of the testes:Correct -the scrotum suspends the testes and adjusts their position to keep testicular temperature slightly below core body temperature, which is necessary for optimal sperm production.
B. Storing urine:Incorrect -urine is stored in the urinary bladder, not in the scrotum.
C. Producing sperm: Incorrect -sperm are produced in the seminiferous tubules inside the testes; the scrotum is a protective/powerful thermoregulatory sac, not the sperm-producing tissue.
D. Carrying sperm to the urethra: Incorrect -ducts such as the vas (ductus) deferens carry sperm toward the urethra; the scrotum does not transport sperm.
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