An infant who has just started cooing and gurgling in response to smiles and attention from its parents is about ________ months old.
A. two
B. ten
C. six
D. four
E. eight
Answer: D
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Sperm carry
A) only one X sex chromosome, exclusively. B) only one Y sex chromosome, exclusively. C) no sex chromosomes. D) two Y sex chromosomes. E) one X or one Y sex chromosome.
Which of the following contribute(s) to the flow of lymph through lymphatic vessels?
A. The pumping of the heart B. The milking action of skeletal muscle contraction C. Pressure changes in the thorax that result from breathing D. Both b and c
The inner cell mass of the blastocyst
A. consists of yolk-filled storage cells. B. contains cells that will form the embryo. C. represents the future placenta. D. will form the zona pellucida. E. contains cells that are discarded.
A tracheotomy is an operation to make an opening in the trachea if there is an upper respiratory obstruction of airflow. Explain how ventilation is possible via this opening and why you don’t need to use your nose or mouth to bring air into your lungs.
What will be an ideal response?