Texts: Pacemaker cells in the heart establish the rhythm of the heartbeat and pacemaker cells in the brainstem establish the rhythm for quiet breathing: 1. Brainstem; brainstem 2. Brainstem; lungs 3. Heart; brainstem 4. Heart; lungs

1. The systemic circulation: 1. A) Receives more blood than the pulmonary circulation 2. B) Receives blood from the left ventricle 3. C) Is a high-pressure system compared to the pulmonary circulation 4. B & C
2. The low-resistance pathways that permit the heart to contract as a functional syncytium (simultaneously) are: 1. Desmosomes 2. Sarcoplasmic reticulum 3. Gap junctions 4. T-tubules
3. With exercise, our heart can get bigger due to: 1. A) Increase in muscle fibers 2. B) Increase in actin and myosin 3. C) Our heart cannot get bigger 4. A & B
4. The urinary system removes organic waste products from body fluids via the process of excretion and then discharges the waste products into the environment, which is called elimination. 1. Homeostasis; excretion 2. Excretion; elimination 3. Elimination; excretion 4. Elimination; homeostasis

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