Which of the following statements about the cardiac cycle is TRUE?
A. The duration of systole is greater than that of diastole in a subject at rest.
B. During isovolumetric ventricular relaxation, blood flows from the atria into the ventricles.
C. Closure of the atrioventricular valves occurs at the onset of ventricular systole.
D. The QRS complex occurs at approximately the same time as the closure of the semilunar valves.
E. The first valves to go from closed to open after the atrial kick are the atrioventricular valves.
C
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You are dissecting a cadaver. You are tracing an individual neuron as it ascends the spinal cord to the brain. You know that this neuron carries somatic sensory information from an afferent presynaptic neuron. Where will you find its axon terminal?
A. Ascending pathways in the dorsal column of the spinal cord carry information about pain from the back muscles. B. Somatic sensory information from the left side of the body projects to the left side of the somatosensory cortex. C. Ascending pathways in the anterolateral column of the spinal cord carry information about fine touch discrimination. D. All somatic sensory information travels together in a single tract in the spinal cord. E. All somatic sensory information that reaches the cerebral cortex is first processed in the thalamus.
The ossa coxae are united anteriorly by the pubic symphysis and posteriorly by the sacrum
Indicate whether this statement is true or false.
Which is not part of the conducting portion of the respiratory system?
A. Alveoli B. Trachea C. Larynx D. Nasal cavity E. Bronchi
Which of the following contains overlapping thick and thin myofilaments?
A. A band B. M line C. Z discs D. H band E. I band