When the atria depolarize, the contractile myocytes of the atria __________________________.When the ventricles depolarize, the contractile myocytes of the ventricles __________________________.Draw a picture of what an ECG would look like from a person with first degree heart block.An electric shock will depolarize a cell. Based on what you know about the physiology of muscle cells, what is the effect on cardiac myocytesof using a defibrillator to simultaneously depolarize all of the cells of the heart?How might a defibrillator stop cardiac fibrillation? What is missing in this person’s ECG?Are the right and left atria contracting in this person?Explain your answer.Are the ventricles contracting in this person?Explain your answer.Based on the table of the cardiac cycle you studied in the heart sounds and blood pressure tutorial (click to open in anew window), what is happening to the amount of blood this person’s heart can pump out with every beat?Explain your answer.
What is a separation of charge called? Where are there more sodium ions, inside or outside the cell? Where are there more potassium ions, inside or outside the cell? What is the flow of charged particles called? If a sodium membrane protein channel opens and allows sodium to diffuse into the cell, what do you think will happen to the membrane voltage? Becomes more and more positive (less negative) If a cell is at its resting membrane potential and a potassium membrane protein channel opens and allows potassium to diffuse out of the cell,what do you think will happen to the membrane voltage? What makes it easy for ions to flow into the cell?What makes it easy for ions to flow out of the cell?What determines the electrical resistance of a membrane? Respiratory System Place the following respiratory structures in the order that inhaled air enters your body. alveoli 6 bronchial tree 5 larynx 3 nose 1 pharynx 2 trachea 4 A water molecule is formed when two hydrogen atoms are covalently bonded to an oxygen atom. Water has surface tension because neighboring water molecules form weak hydrogen bonds with one another. Does surfactant interfere with covalent bonds or hydrogen bonds? The pressure of the air outside your body is called the Atmospheric pressure. The pressure of the air inside your alveoli is called the intrapulmonary pressure. When you are inhaling, the atmospheric pressure is higher than the intrapulmonary pressure. When you are exhaling, the intrapulmonary pressure is higher than the atmospheric pressure. When you blow air out of your nose, you decrease the volume inside your lungs, which increases the pressure inside your lungs, causing air to be pushed out of your body.
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- Spring '11
- Physiology, Action Potentials