BIO 171 Exam #2

The life span of an erythrocyte is about _________ days.

120

How many oxygen molecules may bind to a single molecule of hemoglobin?

4

Typically, an adult's body contains _______ of blood.

5 liters

Plasma makes up about _______ percent of a centrifuged sample of whole blood

55

If a patient becomes dehydrated, the percentage of plasma in a centrifuged sample of his or her blood would likely: (increase or decrease)

Decrease

True or False: If an individual's erythrocytes exhibit surface antigen D, the person is said to be Rh negative

False

True or False: Leukocytes are smaller than erythrocytes

False

True or False: When viewing a centrifuged blood sample, the erythrocytes will be on top

False

True or False: pulmonary arteries carry highly oxygenated blood

False

The maintenance of a blood pH of about 7.4 and correct fluid levels are part of the _______________ function of blood

Regulation

Blood is correctly classified as a(n): _______

Tissue

True or False: About 95% of hypertension cases are essential hypertension, it which the cause is unknown.

True

True or False: Simple put, antibodies are molecules on the lookout for antigens

True

How do veins return blood to the heart?

Veins have one-way valves that prevent backflow in the limbs The contraction of skeletal muscles helps move blood toward the heart

Which are characteristics of type O blood? a: Has anti-A antibodies b: Has anti-B antibodies c: Has surface antigen O on its erythrocytes d: Has surface antigen A on its erythrocytes e: Has neither surface antigen A nor B on its erythrocytes

a,b,e

The smallest and most abundant plasma proteins are the:

albumins

capillaries connect _____________ to venules

arterioles

Which are characteristic of type A blood? a: Has anti-A antibodies b: Has anti-B antibodies c: Has surface antigen A on its erythrocytes d: Has surface antigen B on its erythrocytes e: Has neither surface antigen A nor B on its erythrocytes f: Will agglutinate with blood type B

b,c,f

Which type of leukocyte releases histamine?

basophil

The percentage of the volume of all formed elements in the blood is called the

hematocrit

The reason it is more appropriate to call an erythrocyte a "formed element" rather than a "cell" is that erythrocytes:

lack a nucleus and organelles

Leukocytes are the _______ of the formed elements, and leukocytes have ______________.

largest, prominent nuclei

Old erythrocytes are phagocytized in the _______ and _______

liver, spleen

What region of the thoracic cavity is the heart located?

mediastinum

The type of leukocyte that is very active during a bacterial infection is a(n):

neutrophil

The cell fragments that are a component of blood are

platelets

The "buffy" coat of the middle layer of a centrifuged blood sample is composed of

platelets and leukocytes

Which of the cardiovascular system's circuit has deoxygenated blood in its arteries?

pulmonary circuit

Which circuit of the cardiovascular system is responsible for sending blood to the kidneys, stomach, and pelvic region?

systemic circuit

the arteries and veins that leave and enter the heart are called the great vessels because

they have relatively large diameters

capillaries has only a ___________

tunica intima

unidirectional flow in the heart is ensured because the heart contains _____________ that prevent backflow

valves

The red-pigmented protein in erythrocytes that transports oxygen and carbon dioxide is called _____________

hemoglobin