"I'm going to hold my breath until I die and it will be all your fault!" shrieked the 6-year-old at her father. The child was physically unable to carry out her threat because
A. she could not take in enough oxygen.
B. increased CO2 and hydrogen ion concentration and decreased oxygen concentration stimulate chemoreceptors.
C. she never stopped talking long enough to try to hold her breath.
D. decreased CO2 and hydrogen ion concentration and increased oxygen concentration stimulate chemoreceptors.
Answer: B
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Answer the following statements true (T) or false (F)
1. The tympanic membrane is at the end of the auditory canal. 2. The ceruminous glands produce ear wax. 3. The ossicles are in the middle ear. 4. The handle of the incus attaches to the inside of the eardrum. 5. The stapes presses against the oval window.
Which area of the nephron completely lacks microvilli and is under hormonal control for the reabsorption of sodium?
A) papillary duct B) DCT C) nephron loop D) PCT E) None of the answers are correct.
Which of the following statements is/are TRUE of the growth of the skeleton?
A) It begins to ossify at six weeks of gestational age. B) All bone formation ceases immediately after the end of adolescence. C) Calcification of bones does not occur until an infant begins to learn to walk. D) All of the answers are correct. E) None of the answers are correct.
Describe the main functions of the placenta.
What will be an ideal response?