Which is not a protein found in thin filaments?
A. Actin
B. Troponin
C. Tropomyosin
D. Sarcomyosin
E. No exceptions; all are found in thin filaments
D
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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
What is a capon?
a. a castrated male chicken over 6 pounds and 6 months of age b. a chick between 6-8 weeks old used for meat c. a chick over 8 weeks of age and over 4 pounds d. a female hen used for laying eggs
The term light adaptation refers to
a. the changes that occur in the visual pigment system when going from a dark into a light environment. b. the evolutionary changes that enable a species to maintain a diurnal life style. c. the changes that occur in visual pigment system when going from a light into a dark environment. d. none of these.
Most preganglionic fibers in the sympathetic nervous system synapse with ________
A) no neurons B) somatic neurons C) effectors directly D) 10-20 postganglionic neurons E) parasympathetic neurons