The primary function of the proximal convoluted tubule is
A) filtration of anything small enough to pass through the filtration membrane.
B) absorption of ions, organic molecules, vitamins, and water.
C) secretion of acids, ammonia, and drugs.
D) actively pumping sodium ions and chloride ions out of the filtrate.
E) adjustment of urine volume in response to ADH and aldosterone.
B) absorption of ions, organic molecules, vitamins, and water.
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Which of the following statements is true regarding cardiac muscle?
A) Its main source of ATP production is glycogen. B) The actin and myosin myofilaments are not arranged in sarcomeres. C) Cardiac muscle preferentially metabolizes anaerobically. D) There are specialized gap junctions in cardiac muscle not found in skeletal or smooth muscles. E) Cardiac muscle goes into sustained contractions faster than skeletal muscle.
Two very important second messengers used in the G protein-linked receptor mechanism are cyclic AMP and ________.
Fill in the blank(s) with the appropriate word(s).
Hyposecretion of ________ results in increased urinary output and dehydration
A) mineralocorticoids B) adrenocorticotropic hormone (ACTH) C) antidiuretic hormone (ADH) D) atrial natriuretic peptide (ANP)
The mastoid process
A. is the point of attachment of the temporalis muscle. B. contains mastoid air cells. C. is a sinus. D. is located anterior to the external auditory meatus. E. is part of the zygomatic arch.