Explain autorhythmicity in cardiac muscle cells.
What will be an ideal response?
Autorhythmic cells do not maintain a stable resting membrane potential. Instead, they have an unstable resting potential that continuously depolarizes, drifting toward threshold for firing. These spontaneously changing membrane potentials, called pacemaker potentials, initiate the action potentials that trigger the heart’s rhythmic contractions.
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Answer the following questions true (T) or false (F)
1. Enzymes bind with substrates at their active sites and are permanently altered by the binding process. 2. Due to the low heat capacity of water, the human body is resistant to overheating and cooling down quickly. 3. A base is a hydrogen ion acceptor while an acid is a hydrogen ion donor.
What are the functions of the paranasal sinuses?
What will be an ideal response?
The process by which a mature egg is ejected from the ovary is called ________
A) emission B) menses C) fertilization D) ovulation E) parturition
A ________ is the last structure urine passes through before urine exits the body.
A. ureter B. renal papilla C. calyx D. urethra