The internal and external acoustic meatuses are openings in which bone?
A. The temporal bone
B. The maxilla
C. The parietal bone
D. The frontal bone
E. The sphenoid bone
A. The temporal bone
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A decrease in arterial PO2 stimulates increased ventilation by causing increased firing of action potentials in the afferent neurons from the carotid and aortic body chemoreceptors.
Answer the following statement true (T) or false (F)
Electrical signals move through the mammalian heart in a particular order. Which order is correct?
A) SA node; internodal pathway; AV node; bundle of His; Purkinje fibers B) AV node; SA node; internodal pathway; bundle of His; Purkinje fibers C) SA node; AV node; internodal pathway; Purkinje fibers; bundle of His D) Bundle of His; Purkinje fibers; internodal pathway; AV node; SA node
The primary ossification center in long bones is located in the ________.
A. epiphyses B. diaphysis C. articular cartilage D. central canal
Which are functions performed by the fibrous skeleton of the heart?a: Separates the atria and ventriclesb: Anchors the heart valvesc: Provides electrical insulation between the atria and ventriclesd: Provides the framework for the attachment of the myocardiume: None of these are true functions of the fibrous skeleton of the heart.
A. a, b, c, d B. a, d C. a, c, d D. b, d E. e