Phys Exam 1 Quiz

Phys Exam 1 Quiz

University

20 Qs

quiz-placeholder

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Phys Exam 1 Quiz

Phys Exam 1 Quiz

Assessment

Quiz

Science

University

Medium

Created by

Quaid Guarino

Used 1+ times

FREE Resource

20 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Media Image

The thin filaments in a sarcomere are

F-actin

Myosin

Tropomyosin

Myofibril

2.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Media Image

The thick filaments in a sarcomere are

Tropomyosin

F-actin

Myosin

Troponin

3.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

A 45 year old man presents to the ED with heart palpitations, shortness of breath, chest pain. He is on digoxin and has recently consumed two pedialytes (electrolyte drinks). His resting membrane potential is elevated. What is contributing to this elevation in membrane potential?

Hyperkalemia (elevated serum potassium)

Hypokalemia

Hypernatremia (Elevated serum sodium)

Hyponatremia

Answer explanation

Digoxin blocks the Na/K ATPase which inhibits K+ intake, leading to decreased potassium flux and thus a shift towards the sodium equilibrium potential.

4.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Calcium binds to ______ in the troponin-tropomyosin complex?

Troponin

Tropomyosin

Myosin

Actin

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Extracellular calcium is important for the contraction of which type of myocyte (muscle cell)?

Striated myocyte

Cardiac myocyte

Smooth myocyte

6.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

When calcium binds to calmodulin, it activates which enzyme that enables smooth muscle contraction?

Myosin Light Chain Kinase

Myosin Light Chain Phosphatase

Myosin

Tropomyosin

7.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

How does the troponin-tropomyosin complex regulate striated muscle contraction?

Calcium binds to tropomyosin which induces a conformational change in troponin that exposes the myosin binding site on the F-actin filament

Calcium binds to troponin which induces a conformational change in tropomyosin that exposes the myosin binding site on the F-actin filament

Calcium binds to calmodulin which phosphorylates troponin and exposes the myosin binding site on the F-actin filament

The myosin light chain kinase is phosphorylates tropomyosin and exposes the myosin binding site on the F-actin filament

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