Which would form by way of intramembranous ossification?
A. Clavicle
B. Frontal bone
C. Humerus
D. Metacarpal
Answer: B
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Considering the left ventricle, why does isovolumetric ventricular contraction occur during ventricular systole?
A) The ventricle needs to pressurize the blood to close the aortic valve. B) Ventricular pressure is greater than atrial pressure so the ventricle cannot eject blood. C) The bicuspid valve needs time to shut before the ventricle can eject blood. D) Aortic pressure is higher than ventricular pressure and the ventricle must pressurize the blood to open the aortic valve. E) The ventricle is still filling with blood and therefore cannot eject blood during this time.
To transmit a nerve impulse, acetylcholine diffuses across a space called the ________ to bind to receptors on the postsynaptic membrane.
Fill in the blank(s) with the appropriate word(s).
The hypophysial portal system connects the ________ with the ________.
A. anterior pituitary; posterior pituitary B. hypothalamus; thyroid C. pituitary glands; thyroid D. posterior pituitary; hypothalamus E. anterior pituitary; hypothalamus
The kidneys can help maintain a blood pH which is approaching the alkaline end of its range by excreting ________ ions
A) bicarbonate B) oxygen C) ammonia D) hydrogen