BIOS 255 Comprehensive Exam 4

BIOS 255 Comprehensive Exam 4

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BIOS 255 Comprehensive Exam 4

• Negative feedback

Answer: A process in which the body sense change and activates a mechanism to reverse it

• Examples of negative feedback

Answer: Thermoregulation, blood sugar retention, blood pressure regulation

• Positive feedback

Answer: Feedback that enhances the stimuli

• Example of positive feedback

Answer: Giving birth

• Blood plasma does what?

Answer: Produces antibodies

• Muscle contraction order

Answer:

• Cross bridge formation requires Ca+ & ATP
• Ca+ binds to troponin complex
• Conformation change in troponin Ca+/ tropomyosin exposed binding sites on G actin

subunit

• Myosin head binds to G-actin subunit release of ADP + Pi triggers "power-stroke"
• ATP Binding & dissociation of actin & myosin
• Myosin heads do a powerstroke (using ADP and P) which slides actin and decreases length

of sarcomere (Z line to Z line)

• Osteoblasts function

Answer: Bone formation

• What type of joint is the knee?

Answer: Hinge joint

• What type of immunity do you get after a vaccine with antibodies?

Answer: Artificial acquired active immunity

• How does pH and body temperature affect the affinity of hemoglobin and oxygen?

Answer: Decreases the affinity for hemoglobin to oxygen (meaning oxygen will less likely stick to hemoglobin)

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