A small patch of tissue called the _____ acts as the pacemaker of the heart
A) atrioventricular node
B) bundle of His
C) Purkinje fibers
D) sinoatrial node
Answer: D
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A mentally retarded child with characteristic facial features (flat facial profile, oblique palpebral fissures, low-bridged nose, epicanthal fold, enlarged tongue protruding through the opened mouth) was examined
A karyogamy contained 46 chromosomes, but there was a 14;21 translocation in both the child and the mother. Cytogenetic studies should be performed on the fetus in the next pregnancy because A. all subsequent children will have this syndrome B. approximately 75% of future children will be affected C. approximately 50% of future children will be affected D. the incidence of this syndrome is higher if the mother is the carrier of translocation E. the incidence of this syndrome is higher if the father is the carrier of translocation
The most prevalent degenerative diseases in the United States are those of the ____ system.
A. lymphatic B. cardiovascular C. musculoskeletal D. endocrine E. circulatory
Prolonged exposure to sounds over 85 decibels can damage hearing
a. True b. False Indicate whether the statement is true or false
The urinary bladder is located in the ________ of the pelvic cavity
A) posterior portion B) superior portion C) anterior portion D) convoluted portion