A certain drug is known to block monovalent cation channels. This drug is used as a "muscle relaxer." Would it affect both smooth and skeletal muscles or only skeletal muscles? Defend your answer.
What will be an ideal response?
Skeletal muscle relies on monovalent cation channels for the generation of action potentials to trigger contraction, whereas smooth muscle cells have more "routes" available to trigger contraction. Blocking one route would not be sufficient to cause relaxation; hence, this drug would be more likely to be effective on skeletal muscle.
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Which of the following correctly lists the sequence of structures that a cardiac action potential follows in order to excite normal contraction of the heart?
a) Bundle of His, Purkinje fibers, Atrioventricular (AV) node b) Sinoatrial (SA) node, Purkinje fibers, AV node, Bundle of His c) Purkinje fibers, AV node, SA node, Bundle of His d) SA node, AV node, Bundle of His, Purkinje fibers e) Bundle of His, SA node, AV node, Purkinje fibers
A high count of which of the white blood cells shown in the figure may indicate cancer or hypothyroidism?
a) A b) B c) C d) D e) E
On day 1 of the menstrual cycle, FSH levels will be ________. The follicle that will become dominant is in the ________ stage of maturation. Progesterone levels in blood are ________.
A. rising; preantral to antral; low B. rising; primordial; low C. rising; preantral to antral; high D. falling; expanding; low E. falling; atretic; high
What stimulates the secretion of sebum?
A) low temperatures B) high temperatures C) sex hormones D) UV radiation