Blood & Hematology
A normal hematocrit is approximately what percentage of blood volume?
37–52%
This performs the work of the heart
Myocardium
Which vessels have the thickest tunica media?
Large arteries
Tonsils, thymus, spleen, and lymph nodes are examples of
Lymphoid organs
Fats should make up what percent of daily caloric intake?
25–30%
The buffy coat does NOT contain which type of cell
Erythrocytes
Which node is replaced with a pacemaker if it fails?
Sinoatrial (SA) node
Hypertension is a chronic resting blood pressure higher than
140/90
130/80*
This shows a remarkable degree of involution with age
Thymus
The absorptive state is regulated mainly by what hormone?
Insulin
Where do most RBCs die or is the erythrocyte graveyard
Spleen
Parasympathetic stimulation does what to heart rate?
Reduces it
In the pulmonary circuit, arteries carry this type of oxygen than veins do
Less oxygen
Which immunoglobulin (Ig) makes up 80% of plasma antibodies?
IgG
When should basal metabolic rate be measured?
When a person first rises in the morning, in a post-absorptive state
What is the universal donor of RBCs
O, Rh-negative
During atrial systole, what happens on the EKG?
It begins immediately after the P wave
Increased filtration, reduced reabsorption, or lymph blockage can cause what?
Edema
Cells infected by viruses release this to signal nearby cells
Interferons
Why do weight-loss diets slow down after initial success?
Because the body lowers its metabolic rate after weight loss
A deficiency of this vitamin can cause pernicious anemia
Vitamin B12
What is the correct path of electrical excitation to a left ventricle?
SA node → AV node → AV bundle → subendocardial conducting network → LV cardiocyte
Myocardial infarction can lead to which type of shock?
Cardiogenic shock
HIV primarily targets which immune cells?
Helper T cells
Which of the following does not raise total metabolic rate: starvation, anxiety, fever, eating a big meal, or pregnancy?
Starvation