Which type of extracellular junction forms an impermeable barrier between cells?
A. Tight junction
B. Adhesion junction
C. Membrane junction
D. Gap junction
Answer: A
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Which of the labeled steps in the diagram represent formation of the endocardial tubes?
a) A b) B c) C d) D e) E
During organogenesis, which somite-derived structure gives rise to the muscles of the trunk?
A. The pharyngeal pouches B. The myotome C. The coelom D. The dermatome E. The sclerotome
Control of skeletal muscle is the responsibility of:
A) an autonomic ganglion. B) a preganglionic neuron. C) a somatic motor neuron. D) a postganglionic neuron.
The aortic valve
a. prevents the backflow of blood into the aorta during ventricular diastole b. prevents the backflow of blood into the left ventricle during ventricular diastole c. prevents the backflow of blood into the right ventricle during ventricular diastole d. closes when the first heart sound is heard e. does not do any of the above