MCAT Session 3

Physics

Know all of the equations and units!!!!!Important things to remember from this

section Converging have + focal lengths Diverging have – focal lengths Virtual = upright image Real = inverted image Only converging mirrors can produce a real image

ANSWERS – Physics Exam 5

93. B 103. B 113. A94. D 104. C 114. B95. B 105. A 115. A96. A 106. C97. B 107. D98. D 108. C99.D 109. C100. A 110. A101. C 111. C102. A 112. C

Psychology and Sociology

Difference Threshold – a just noticeable difference, describes the smallest difference that is sufficient for a change in stimulus to be noticed More sensitive the sensory system = the smaller the

change that is required for detection Weber’s Law – the change required to meet

the difference threshold is a certain fraction of the originally presented stimulus.

Psychology and Sociology Exam 5

93. B 103. C 113. A94. D 104. A 114. C95. C 105. B 115. B96. C 106. B97. A 107. D98. D 108. A99.B 109. B100. C 110. C101. A 111. C102. D 112. A

Important things to know about bones:

osteoblasts secrete collagen and create the bone matrix, become enveloped in bone and mature to osteocytes. Osteocytes exchange nutrients and waste with the bloodstream

Osteoclasts are the ones that eat up bone. They “resorb” bone matrix and increase the blood concentration of calcium and phosphate

“Blasts build bone, clasts consume”

Bone Hormones: PTH v. calcitonin

PTH (parathyroid hormone) comes from the parathyroid(!), is a peptide hormone It ultimately INCREASES blood Ca2+ through

increasing: osteoclast bone resorption, osteoclast proliferation, renal Ca2+ reabsorption, Ca2+ uptake at GI, vitamin D derivation

Calcitonin… Comes from the thyroid and is also a peptide Lowers blood Ca2+ by decreasing osteoclast activity

and decreasing osteoclast proliferation

Calcitonin “tones” down osteoclast activity

Bone Facts

2 types: spongy and compactSpongy bone has red marrow and is where

hematopoeisis occurs (RBC proliferation)Compact bone has yellow marrow which is

populated with adipocytes- It is where most Ca2+ and PO43- is stored

Blood cells are red, fat cells are yellow

Bio Exam 6 Answers

116. C 126. D 136. A117. A 127. A 137. B118. D 128. D 138. C119. B 129. C120. A 130. D121. B 131. C122.B 132. A123. A 133. D124. B 134. C125. C 135. C

How to determine pH and hydrogen ion concentration

[H+] = 1 x 10-4 then the pH = 4 If the pH = 7 then the [H+] = 1 x 10 -7

If the [H+] = 4 x 10-3 then the pH is between 2 and 3 (an estimation between 2 and 3 is sufficient for the MCAT)