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Figure 20-1 The HeartUse Figure 20-1 to answer the following questions:Identify the structure labeled “21.”

Which of the following statements is true regarding cardiac muscle?

Figure 20-1 The HeartUse Figure 20-1 to answer the following questions:Identify the structure labeled “21.”

Figure 20-2 Cardiac CycleUse Figure 20-2 to answer the following questions:What occurs at the circled label “4” on the graph?

The simple columnar epithelia that line the stomach have an average life expectancy of __________ days.

The jejunum

The simple columnar epithelia that line the stomach have an average life expectancy of __________ days.

The ________ is a remnant of an important fetal blood vessel that once linked the pulmonary and systemic circuits.

The coronary sinus drains the ________ into the ________.

Hormones from the adrenal cortex that regulate electrolyte balance are