A stimulus below the ________ will activate sensory neurons, but the signal will not reach the conscious brain because higher neurons dampen it.
Fill in the blank(s) with the appropriate word(s).
perceptual threshold
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What does the posterior pituitary gland release into the blood?
a. steroid hormones b. secretin and cholecystokinin c. adipokines d. vasopressin and oxytocin e. cortisol and epinephrine
Which of the following is not a function of the respiratory system?
A. It helps to expel abdominal contents during defecation and childbirth. B. It contributes to maintenance of pH balance. C. It helps to transport gases to tissues. D. It allows exchange of oxygen and carbon dioxide between blood and air. E. It permits vocalizations.
What structure ultimately regulates the passage of materials from the blood into the cerebrospinal fluid and the brain?
A. dura mater B. pia mater C. cranium D. arachnoid mater E. meninges F. blood brain barrier
The part of the respiratory system with the largest internal surface area is the ________.
A. bronchi B. trachea C. visceral pleura D. pulmonary alveoli