Physioex - Study guides, Class notes & Summaries

PhysioEx 3- Neurophysiology Exam 2023...

What is the key variable in an isometric contraction of a skeletal muscle? - The length-tension relationship. Based on the unique arrangement of myosin and actin in skeletal muscle sarcomeres, explain why active force varies with changes in the muscle's resting length. - When the skeletal muscles resting length increases, there is more time for myosin bridges to return to their starting position. Note the dip in total force at a muscle length of 90 mm as compared to the total force at a mu...

TABLE OF CONTENTS The Human Body: An Orientation Exercise 1. The Language of Anatomy Exercise 2. Organ Systems Overview The Microscope and Its Uses Exercise 3. The Microscope The Cell Exercise 4. The Cell: Anatomy and Division Exercise 5. The Cell: Transport Mechanisms and Cell Permeability Histology: Basic Tissues of the Body Exercise 6. Classification of Tissues The Integumentary System Exercise 7. The Integumentary System The Skeletal System Exercise 8. Overview of the Skeleton:...

Which of the following is INCORRECTLY matched with its secreting organ? a) TRH – hypothalamus b) TSH – posterior pituitary c) thyroxine – thyroid gland d) triiodothyronine – thyroid gland TSH – posterior pituitary A decrease in the level of thyroxine would increase the secretion of _______. a) neither TSH nor TRH b) TSH c) TRH d) both TSH and TRH

The neurotransmitter released into the synaptic gap reaches the target cell by - diffusion You have just observed that each action potential in a burst can trigger additional neurotransmitter release. If calcium ions are removed from the extracellular solution, what will happen to neurotransmitter release at the axon terminal? - there will be more neurotransmitter release The end of the axon where it contacts a target is called the - axon terminal Neurotransmitter is released into the synap...

Neurophysiology of Nerve Impulses. Physioex 3 qestions with complete solutions 2024

Describe the difference between the rate of diffusion seen for sodium and urea. - CORRECT ANSWERS a. urea diffused faster because it is larger than Na b. urea diffused faster because it is smaller than Na c. urea diffused slower because it is larger than Na d. urea diffused slower because it is smaller than Na. c. Glucose is a six-carbon sugar. Albumin is a protein with 607 amino acids. The average molecular weight of a single amino acid is 135 g/mole. There is no reason to run these s...

Neurophysiology of Nerve Impulses. Physioex 31. Explain why increasing extracellular K+ reduces the net diffusion of K+ out of the neuron through the K+ leak channels. - correct answer Increasing the extracellular K+ reduces the steepness of the concentration gradient and so less K+ diffuses out of the neuron. 2. Explain why increasing the extracellular K+ causes the membrane potential to change to a less negative value. - correct answer The membrane potential became less negative because les...

Physioex 3: Neurophysiology question with complete solution graded A+ 2023What is the approximate concentration of K+ inside a typical cell (intracellular concentration)? - correct answer 150 mM What is the approximate concentration of K+ outside a cell (extracellular concentration)? - correct answer 5 mM What is the approximate concentration of Na+ inside a cell (intracellular concentration)? - correct answer 5 mM What is the approximate concentration of Na+ outside a cell (extracellul...

Briefly describe the need for controls and give an example used in this activity. - controls are needed to validate the results of the experiment. tube 5 is an example where the enzyme that tests for contaminating glucose in the starch is absent What effect did boiling and freezing have on enzyme activity? Why? - the boiling denatured the enzyme and inactivated it as predicted. the freezing has no effect on the enzyme At what pH was the amylase most active? Describe the significance of this...