Trace the pathway of sound as it enters the external ear until it is perceived in the brain.
What will be an ideal response?
A sound wave passing through the external acoustic meatus causes the eardrum to vibrate at the same frequency as the wave. The auditory ossicles amplify and deliver vibrations to the oval window. Pressure waves in the cochlear fluids cause basilar membrane resonance that stimulates the hair cells of the spiral organ (of Corti). Impulses are then generated along the cochlear nerve that travel to the cochlear nuclei of the medulla and, from there, through several brain stem nuclei to the auditory cortex of the brain.
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State the components of the internal environment and explain how materials are exchanged into and out of the cell
What will be an ideal response?
What part of the eye produces aqueous humor?
A. Ciliary body B. Pupil C. Sclera D. Retina
The volume of blood pumped during each cardiac cycle is the
A. stroke volume. B. cardiac output. C. cardiac reserve. D. end-systolic volume. E. end-diastolic volume.
Which of the following is NOT true of the fontanels?
A. They are sometimes called "soft spots." B. They occur between the flat bones of the skull, the vertebrae, and the long bones of the upper and lower limbs. C. They are areas of incomplete ossification in the skull of an infant. D. They allow for cranial compression during childbirth, and rapid brain development after birth. E. All of these are true of the fontanels.