Most of the freely movable joints of the body could be classified both structurally and functionally as __________.
A: cartilaginous and synarthroses
B: synovial and diarthroses
C: cartilaginous and amphiarthroses
D: synovial and amphiarthroses
E: fibrous and diarthroses
B: synovial and diarthroses
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During vigorous exercise, there may be insufficient oxygen available to completely break down pyruvic acid for energy. As a result, the pyruvic acid is converted to ________.
A) a strong base B) stearic acid C) hydrochloric acid D) lactic acid
The heart pumps about ____ liters of blood a day and contracts about _____ times in a
lifetime. A) 3,000 liters; 2 billion B) 1,200 liters; 2 billion C) 7,000 liters; 2.5 billion D) 1,000 liters; 1 billion
Which of the following statements about excitation-contraction coupling is incorrect?
A) Calcium ions travel through the transverse tubule. B) Calcium ion is released from the sarcoplasmic reticulum. C) Tropomyosin moves to expose myosin binding sites on actin. D) Troponin binds calcium ion and signals tropomyosin to move. E) Relaxation requires uptake of calcium ion by the sarcoplasmic reticulum.
Which of the following prenatal tests is non-invasive?
A) Chorionic villi sampling B) Amniocentesis C) Inserting a shunt into a fetus with water on the brain D) Ultrasound