This cord attaches the embryo to the placenta
A) abdominoplacental cord B) umbilical cord
C) yolk sac D) allantois
Answer: B
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The ______________________ prevents food from going into the nasal cavity while swallowing
Fill in the blank(s) with correct word
Which of the following are lipids that are routinely used for energy?
A. Phospholipids B. Steroids C. Triglycerides D. Amino acids
Which respiratory structure has only simple squamous epithelium lining its mucosa?
A) Diaphragm B) Left lung C) Alveolus D) Bronchiole
Which of the following conditions must be met if diffusion across a membrane is to occur?
A) A concentration gradient must be present, and the membrane can't be permeable to the substance being transported. B) A concentration gradient must be present, and the membrane must be permeable to the substance that is to be transported. C) The membrane must be permeable to the substance that is to be transported. D) A concentration gradient must be present.