A doctor puts his stethoscope on a patient's chest over the location of the heart and hears a swishing sound. Which of the following conditions is the best diagnosis for the patient's condition?
a. angina pectoris
b. myocardial infarction
c. incompetent cardiac valve
d. cardiac tamponade
Ans: c. incompetent cardiac valve
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Platyhelminthes can live without a circulatory or respiratory system because
A) They rely on their digestive system. B) They are dorsoventrally flattened. C) The kidney excretes excess waste materials. D) The epidermis secretes lubricants.
The sodium-potassium pump located in the plasma membrane
A. actively transports potassium into cells. B. osmotically moves sodium into cells. C. actively transports water out of cells. D. actively transports sodium into cells. E. moves chlorine out of cells.
Define intramembranous ossification
A) Intramembranous ossification is the formation of hyaline cartilage from mesenchymal cells. B) Intramembranous ossification is the formation of elastic cartilage from mesenchymal cells. C) Intramembranous ossification is the formation of fibrocartilage from mesenchymal cells. D) Intramembranous ossification is the replacement of a cartilage model with bone. E) Intramembranous ossification is bone formation within connective tissue without the prior development of a cartilage model.
Your young child has a middle ear infection: otitis media. There is a build-up of fluid, bacteria, and white blood cells, or pus, inside of the middle ear chamber. Why has this affected the child's hearing?
A) The cochlear receptor cells cannot move. B) The bacterial infection has destroyed the otoliths. C) The round window cannot vibrate to dissipate pressure. D) The auditory ossicles cannot vibrate freely. E) The tympanum is destroyed.