You are babysitting two children who are having a contest to see who can hang upside-down for the longest time. At the end of the contest, both children feel dizzy and are worried they are sick. Explain to them why they feel this way and why the effect is only temporary. (Hint: Consider how the baroreceptor reflex responds when a person hangs upside-down.)
Match the following terms with the correct definition.
____ Auricle
____ Aorta
____ Coronary sinus
____ Papillary muscle
____ Fossa ovalis
____ Pectinate muscle
____ Venae cavae
____ Pulmonary trunk
____ Chordae tendineae
____ Pulmonary veins
a. Drainage point for the coronary veins
b. Extensions that attach papillary muscles to valves
c. Remnant of a hole present in the fetal interatrial septum
d. Two largest veins of the systemic circuit
e. Flaplike extension from the right or left atrium
f. Finger-like projections of ventricular muscle
g. Main artery of the pulmonary circuit
h. Veins that drain the pulmonary circuit
i. Largest artery of the systemic circuit
j. Ridges of muscle in the atria
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Key Concepts
Cardiac Anatomy
Circulatory System
Fetal Circulation
Which of the following would produce a decrease in blood pressure?
a. Increased cardiac output
b. Vasodilation
c. Vasoconstriction
d. Increased blood volume
Explain why the skin and lips of fair-skinned individuals may 'turn blue' in very cold weather.
Which of the following factors would increase peripheral resistance?
a. Increased blood viscosity
b. Shorter vessel
c. Vasodilation
d. An increase in vessel radius
Fill in the blanks: The coronary arteries are the first branches off the ________. The right coronary artery becomes the ________ on the posterior side of the heart. The left coronary artery branches into the ________ and the ________.
Ms. Rodgers has been diagnosed with secretion of inappropriate ADH syndrome (SIADH). What effect will SIADH have on the amount of water in her body? What symptoms would you expect from this condition? How would it affect her blood pressure and net filtration pressure?
