Which of the following is a part of the second line of defense against microorganisms?
A) keratin
B) cilia
C) gastric juice
D) phagocytes
D) phagocytes
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Which of the following helps maintain a high solute concentration in the kidney medulla?
A. high urea concentration in medulla B. active transport of solutes from ascending limb C. the vasa recta D. functions of the loop of Henle E. All of these choices are correct
Llamas, cats, and rabbits are called ____________ ovulators because the ovum is only released after ovulation
Fill in the blank(s) with correct word
If you wanted to pick up something heavier than your pencil (such as your book), you would need to have a stronger muscle contraction. In what way might you accomplish this?
a. stimulate more motor units b. decrease the frequency of stimulation to allow a more prolonged contraction to occur c. decrease the refractory period d. block acetylcholinesterase at the neuromuscular junction to allow acetylcholine to function longer e. none of these answers.
In fetal circulation, the blood containing the highest amount of oxygen is found in the ________.
A. heart B. ductus arteriosus C. aorta D. umbilical vein E. umbilical arteries