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A beating heart makes a “lub-dup, lub-dup, lub-dup” sound. (Check after class if you don’t believe me.) What makes the “lub”? What makes the “dup”? Here’s a hint, the two are related but slightly different things. Then give the proper anatomical name for ONE of the structures involved. (1 point each, 3 points total)

True or False: Neurons and muscles use different ions to generate action potentials.

True or False: There are three tiny little bones in each of your ears.

Solve the system of equations by Gauss Jordan (matrices).  If no solution exists, enter in DNE for x, y, and z. You must use this technique. If you use another technique, even if you arrive at the correct answer your score on this problem will be a zero. Also, to get full credit your last matrix needs to be in row reduced form. x     –   y     +   2 z   =   – 5   4 x   +     z =   0 – x   +   y   –   2 z   =   20 x = [BLANK-1] y = [BLANK-2] z = [BLANK-3]

Fill in the blanks: Apex, Branches, Diastole, P, QRS, Septum, Systole, T The body uses a pacemaker to coordinate contraction in the heart. The initial depolarization of the heart’s cells appears as the _______ wave in the electrocardiogram (that’s the ECG or EKG). But the atrial _______ (or contraction) doesn’t begin for a moment longer. Meanwhile, the depolarization travels down the _______ that goes between the sides of the heart, in special modified nerves called bundle _______ (plural). From the bottom of the heart, which confusingly is called the  _______ , the depolarization wave travels upwards through Purkinje fibers. This massive depolarization produces the _______ wave, which hides the wave from atrial _______ , or relaxation. The rest of the heart relaxes soon after, producing the _______ wave. If it’ll help you, here’s a picture of the ECG:

Compute the following product Screenshot 2025-11-15 093424.png

Solve the system of equations using the inverse matrix method.  If no solution exists, enter in DNE for both x and y. You must use this technique. If you use another technique, even if you arrive at the correct answer your score on this problem will be a zero.  The inverse of the matrix   Screenshot 2025-11-15 105822.png Solve. – 2 x   +   6 y   =   6   3 x   +   2 y   =   13 x = [BLANK-1] y = [BLANK-2]

Air moves out of your lungs because there’s too much air already in there.

Which of the following is true of arteries?

After completing the exam, you must submit your work on Blackboard, Under Content, underneath the Exam 5 folder, directly below this exam, in a folder entitled “Work for Exam 5” within 15 minutes. Failure to submit the work will result of a score on zero on this exam. Make sure to name the file Exam5_YourName.   Consider the system of inequalities. x2 + y2-49 ≤0-x + y