单项选择题

Which of the following statements concerning mature skeletal muscle is FALSE

A．The cells are multinucleated
B．A sarcomere is the region between two successive Z disks
C．The nuclei are centrally located
D．Myofidrils display a characteristic crossbanding pattern
E．Actin, myosin, troponin, and tropomyosin are present

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单项选择题Which of the following statements concerning the epicardium is TRUE

A．It is continuous with the endocardium
B．It is the visceral pericardium
C． It possesses modified cardiac muscle cells
D．It functions to increase intraventricular pressure
E．It possesses cardiac muscle cells

单项选择题.Energy production in mature erythrocytes is accomplished by which one of the following

A．Glycolytic pathway
B．Mitochondria
C．Electron transport system
D．Citric acid cycle (Krebs cycle)
E．Golgi complex

单项选择题The axon hillock contains

A．rough endoplasmic reticulum
B．ribosomes
C．microtubules
D．Golgi complex
E．synaptic vesicles

单项选择题Which one of the following statements regarding osteocytes is FALSE

A．They communicate with each other via haversian canals
B．They live for a long time
C．They possess long cytoplasmic processes
D．They are housed in their own lacunae
E．Osteocytes communicate with each other via narrow cytoplasmic processes that extend through canaliculi.

单项选择题Which one of the following statements about epithelia is FALSE

A．They are polarized
B．They are vascular
C．They are separated from underlying connective tissue by a basal lamina
D．They contain only a small amount of intercellular substance
E．They line the lumen of blood vessels