Unit 2, group 2: Nathan, Maria, and Yvette

Question 1

Inotropic

Answer 1

Contractility strength

Question 2

Chronotropic

Answer 2

Firing rate

Question 3

Dromotropic

Answer 3

Conduction rate

Question 4

Heart Sound 1 (S1)

Answer 4

Caused by atrioventricular valves closing because atrial pressure is less than ventricular pressure

Question 5

What are baroreceptors?

Answer 5

Baroreceptors

• Stretch receptors
• Most sensitive to decrease in blood pressure
• Increase in blood pressure causes increased stretch, increasing frequency of APs

Question 6

Heart Sound 2 (S2)

Answer 6

Caused by semilunar valves closing due to greater pressure in aorta and pulmonary trunk

Question 7

Platelets

Answer 7

• also known as thrombocytes
• fragments of megakaryocytes
• critical for clotting
• no nuclei
• life span is 5-9 days

Question 8

Why are platelets?

Answer 8

-release seretonin and form mass of clot

Question 9

Immunoglobulins (All

Answer 9

• IgM: First class released by plasma cell (diagnosis of infection), fixes complement
• IgA: Functions as dimer, found in mucus and on body surfaces
• IgD: B cell antigen receptors
• IgE: Stem is bound to mast cells and basophils, causes them to release histamine and cytokines (mediates inflammatory response, allergy)
• IgG: Main type (primary and secondary immune response), can cross placenta (passive immunity to fetus), fixes complement