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1

Small organisms do not have circulatory systems, so gas exchange and excretion occur by a process called ____________.
A)active transport
B)passive transport
C)diffusion
D)osmosis
2

Respiratory systems operate independently from an open circulatory system in the __________.
A)insects
B)squids
C)annelids
D)vertebrates
3

Which of the following are respiratory pigments?
A)hemoglobin
B)hemocyanin
C)Both a and b are correct.
D)Neither of these is correct.
4

Double circulation, using a four-chambered heart, ensures that oxygenated blood reaches tissues quickly in _______________.
A)amphibians and reptiles
B)birds and mammals
C)all vertebrates
D)mammals only
5

What portion(s) of the heart is/are the most muscular?
A)pericardium
B)vena cavae
C)atria
D)ventricles
6

True or false. The lub part of the heartbeat is the closing of the semilunar valves.
A)True
B)False
7

Blood flows from the right ventricle into ____________.
A)pulmonary arteries
B)pulmonary veins
C)the aorta
D)the right atrium
8

True or false. Another name for contraction of heart muscle is systole.
A)True
B)False
9

What part of the heart is the pacemaker?
A)atrioventricular node
B)sinoatrial node
C)Purkinje fibers
D)right atrium
10

An electrocardiogram measures _____________ that accompany the contraction of the heart.
A)chemical changes
B)sympathetic impulses
C)electrical changes
D)parasympathetic
11

Which of the following types of tissue are found in the arteries?
A)connective tissue
B)elastic tissue
C)endothelium
D)All of these are correct.
12

Gas exchange between blood and tissue cells occurs through _________.
A)arteries
B)arterioles
C)capillaries
D)venules
E)A, b, and c are correct.
13

Blood leaving the intestines on its return to the heart first travels through the ________________.
A)pulmonary circuit
B)systemic circuit
C)renal artery
D)hepatic portal system
14

The higher number of a blood pressure reading is a measurement of arterial pressure during ___________.
A)ventricular systole
B)ventricular diastole
C)atrial systole
D)atrial diastole
15

Which of these is a component of blood?
A)plasma
B)formed elements
C)platelets
D)All of these are correct.
16

What blood cells or cell fragments can carry oxygen?
A)red blood cells
B)white blood cells
C)platelets
D)All of these are correct.
17

What hormone released from the kidney induces the production of more blood cells?
A)cortisol
B)aldosterone
C)erythropoietin
D)glucagon
18

Approximately how long do white blood cells live?
A)3 days
B)2 weeks
C)6 months
D)1 year
19

At the same time platelets start to gather at a site of injury, the damaged tissue releases the protein _____________ that signals plasma proteins to coagulate.
A)thromboplastin
B)thrombin
C)fibrinogen
D)fibrin
20

True or false. The lymphatic system collects fluid lost from general circulation and returns it to the bloodstream.
A)True
B)False
21

The largest component(s) of the lymphatic system is/are the _____________.
A)thymus
B)lymph nodes
C)spleen
D)tonsils





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