Groups of similar cells and extracellular products that carry out a common function are called
A. tissues.
B. matrices.
C. organ systems.
D. organs.
E. None of the choices is correct.
Answer: A
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Indicate whether the statement is true or false
In compact bone, ___________ connect adjacent lacunae, thereby providing pathways for nutrients and other materials to pass between osteocytes
A. osteonic canals B. blood vessels C. lamellae D. canaliculi E. perforating canals
The sequence of arteries supplying most of the blood to either knee is ________.
A. abdominal aorta ? common iliac artery ? internal iliac artery ? femoral artery ? popliteal artery B. abdominal aorta ? common iliac artery ? deep femoral artery ? anterior tibial artery ? popliteal artery C. abdominal aorta ? common iliac artery ? external iliac artery ? femoral artery ? popliteal artery D. abdominal aorta ? internal iliac artery ? deep femoral artery ? anterior tibial artery ? popliteal artery
Explain why the propagation of action potentials along electrically excitable membranes occurs in only one direction
A) The refractory period prevents it from propagating back in the direction from which it began. B) All electrically excitable membranes have two poles, a positive and a negative pole, and the action potential can only travel towards the positive pole. C) All electrically excitable membranes have two poles, a positive and a negative pole, and the action potential can only travel towards the negative pole. D) The stimulation of electrically excitable membranes by neurons occurs on only one side of the membrane so it will travel to the other side. E) The repolarization period prevents it from propagating back in the direction from which it began.