The diagram below shows a sarcomere. If a disorder limits the number of calcium ions that can bind to actin, which symptom would a person suffering from this disorder most likely display? A: Fatigue from constant muscle contraction
B: weakness from an inability to contract muscles
C: Anxiety caused by an increased heart rate
D: Shortness of breath caused by inefficient gas exchange

Once an egg cell is fertilized by sperm, the cell then, as the embryo develops, it receives nourishment and eliminates wastes by transferring substances from its blood to its mother's blood. a. becomes a fetus immediately and exits the womb b. begins to divide and implants itself in the wall of the uterus c. remains in the uterus without dividing for several months d. travels back to the ovaries until the fetus is developed