The major difference between an embryo and a fetus is that
A. a fetus can survive outside the mother's womb but an embryo cannot.
B. a fetus is smaller than an embryo.
C. organ systems are developing in an embryo while all organs are present in a fetus.
D. a fetus is a male child while an embryo is a female child.
E. None of these choices is correct.
C
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What will be an ideal response?
Which of the following is (are) true of a motor response triggered by a reflex stimulus?
A) It may be damped by mediation from the centers in the brain. B) It can be simple or complex, depending upon the reflex arc involved. C) It may cause a strong action, because the effector organ acts in an unopposed manner. D) It may involve responses from interactions between multiple interneuron pools. E) All of the answers are correct.
In general, water-soluble molecules diffuse through the ________; and lipid-soluble molecules diffuse through the ________.
A. membrane channels; membrane channels B. lipid bilayer; membrane channels C. membrane channels; lipid bilayer D. lipid bilayer; lipid bilayer E. None of the choices are correct.
A volleyball player depends on the gastrocnemius muscles for plantar flexion, whereas a marathon runner depends more on the soleus muscles for the same action. What characteristic of the soleus muscles makes this so?
A. They have more glycogen in them. B. They break ATP down to ADP and Pi faster. C. They don't have as many blood capillaries per gram of tissue. D. They have smaller mitochondria. E. They make more use of aerobic respiration.