Which of the following events of endochondral ossification occurs last?
A. Blood vessels grow into the primary ossification center.
B. Cartilage is calcified in the cartilage model.
C. Secondary ossification centers appear in the epiphyses.
D. A cartilage model is formed by chondroblasts.
E. Osteoblasts produce trabeculae and lamellae on the surface of calcified cartilage.
Answer: C
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Which of the following nerves has parasympathetic axons?
A. facial B. trigeminal C. hypoglossal D. spinal accessory E. abducens
What does the countercurrent mechanism accomplish in the nephron loop?
A) production of very dilute urine B) creation of a steep concentration gradient for continued water reabsorption C) secretion of water and electrolytes into the filtrate D) constriction of the arterioles to increase blood pressure
Lymphoid organs differ from lymphoid tissues in what way?
A) They contain T lymphocytes and lymphoid tissues do not. B) They are found in the digestive tract and lymphoid tissues are found in the thorax. C) They are surrounded by a fibrous capsule and lymphoid tissues are not. D) They cannot produce antibodies, whereas lymphoid tissues can. E) None of the answers is correct.
A motor unit is a single muscle plus all of the motor neurons that innervate it
Indicate whether the statement is true or false