In the centrifuged sample of blood illustrated, what blood components are contained in the layer labeled number 3?
A. Plasma and water
B. Leukocytes and platelets
C. Plasma, water, waste materials, and electrolytes
D. Erythrocytes
E. Leukocytes and waste materials
Answer: B
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Answer the following statements true (T) or false (F)
1. Calcitonin targets the bones and causes the release of calcium from storage when serum levels are low. 2. The normal pH of blood is 7.35-7.45. 3. Most acidic substances (hydrogen ions) originate as by-products of cellular metabolism. 4. Weak acids are able to act as chemical buffering systems for the body because they partially dissociate. 5. The phosphate buffer system is relatively unimportant for buffering blood plasma.
Which pericardial structure makes contact with the heart wall?
A) pericardial cavity B) parietal pericardium C) visceral pericardium D) fibrous pericardium
Norepinephrine stimulates cravings for carbohydrates, whereas endorphins stimulate cravings for proteins
Indicate whether the statement is true or false
Which of the following is not a feature of cardiac muscle?
A) They depend almost exclusively on aerobic respiration. B) They have larger than average mitochondria. C) They are rich in glycogen. D) They are very rich in myoglobin. E) They have about the same endurance as skeletal muscle fibers.