26. The part of the ear which contains mechanoreceptors to transform sound waves

ID: 73029 • Letter: 2

Question

26. The part of the ear which contains mechanoreceptors to transform sound waves into electrical impulses is the:

A. Tympanic membrane

B. Tympanic cavity

C. Vestibule

D. Organ of Corti

E. Eustachian tube

27. The division of the autonomic nervous system that is responsible for the fight-or-flight response is the:

A. Somatic

B. Sympathetic

C. Autonomic

D. Parasympathetic

E. Adrenal medulla

28. A peptide hormone that increases blood calcium levels is called:

A. Calcitonin

B. Aldosterone

C. Parathyroid hormone

D. Cortisol

29. In the sliding filament model of muscle contraction, the first step in the process of contraction is:

A. Calcium binds to tropomyosin thus exposing the active binding sites on the actin microfilaments

B. Calcium binds to the myosin heads activating them to form cross-bridges with the actin microfilaments

C. Troponin binds to the exposed heads of myosin causing the thick and thin filaments to slide over each other

D. Calcium binds to troponin causing tropomyosin to expose the binding sites on the actin microfilaments so that myosin can form cross-bridges

30. The volume of air that enters the lungs past a tidal inspiration is called the:

A. Post-tidal volume

B. Inspiratory reserve volume

C. Respiratory reserve volume

D. Residual volume

E. Expiratory reserve volume

26)d

27)b

28)a

29)c

30a

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