Answer the following questions true (T) or false (F)
1. Corticotropin-releasing hormone (CRH), released by the placenta, increases the production of cortisol from the adrenal cortex, which is needed for the maturation of the fetal lungs and the production of surfactant.
2. A pregnant woman typically needs about 300 extra calories each day to support both herself and the fetus.
3. Dilation is the longest of the three stages of labor.
1. TRUE
2. TRUE
3. TRUE
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The blood type of a person missing the surface antigen D is Rh-positive.
Answer the following statement true (T) or false (F)
Gram for gram, carbohydrate provides about twice as much energy as protein.
Answer the following statement true (T) or false (F)
Muscle fatigue arises primarily from failure in
A) neuromuscular transmission. B) signal relay from brain to spinal cord. C) initiation of contraction by the motor cortex. D) calcium pumps in the skeletal muscles. E) excitation-contraction coupling.
The Ca2+Â required for skeletal muscle contraction ________.
A. enters the cell due to the opening of voltage regulated Ca2+Â channels from the T tubules B. is released from the sarcoplasmic reticulum C. is actively transported into the cell D. is released from mitochondria