In the autorhythmic cells, the ________ channels open when the cell membrane potential is -60 mV. These channels are permeable to ________ and ________.

Fill in the blank(s) with the appropriate word(s).


If ; K+, Na+

Anatomy & Physiology

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Circadian rhythms are regulated by ____

a. aldosterone b. melatonin c. cortisol d. estrogen

Anatomy & Physiology

A point of attachment for muscles that rotate or extend the head is the

A) styloid process. B) mastoid process. C) palatine process. D) coronoid process. E) zygomatic process.

Anatomy & Physiology

The vestibule and the ____ function in the maintenance of balance (equilibrium)

a. semicircular canals b. cochlea c. ossicles d. stapes

Anatomy & Physiology

Hormones are chemical messengers produced by the ________ system that helps in maintaining homeostasis

A) nervous B) endocrine C) urinary D) cardiovascular

Anatomy & Physiology