Laboratory Manual for Human Anatomy & Physiology (Cat Version)
4th Edition
ISBN: 9781259864612
Author: Martin
Publisher: MCGRAW-HILL HIGHER EDUCATION
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Textbook Question
Chapter 21, Problem 2.2.3A
Complete the following:
Is there a difference in fatigue times between the two forearms? Why might this happen?
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Analyze the Barbell press (overhead or military press) exercise by breaking the exercise into a lifting phase and lowering phase. For each phase, match the joint movements occurring and then match the force causing movement (muscle or gravity), the force resisting movement (muscle or gravity) and the functional muscle group, type of contraction with each joint for the respective phase.
Lifting phase - Elbow - Movement occurring
Lifting phase - Elbow - Force causing movement
Lifting phase - Elbow - Force resisting movement
Lifting phase - Elbow - Functional muscle group, type of contraction
Lifting phase - Glenohumeral - Movement occurring
Lifting phase - Glenohumeral - Force causing movement
Lifting phase - Glenohumeral - Force resisting movement
Lifting phase - Glenohumeral - Functional muscle group, type of contraction
Lifting phase - Shoulder girdle - Movement occurring
Lifting phase - Shoulder girdle - Force causing movement
Lifting phase -…
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The three main forces that act on the patella are shown on
the diagram of the knee joint below. These forces are the
quadriceps muscle force (FQ), the patella ligament force
(FPL), and the patellofemoral joint reaction force (FPF). The
angles a and ẞ are with respect to a line that is
perpendicular to FPF. Assuming a = 15°, ẞ = 20°, and FQ =
3725 N, use equations for static equilibrium to calculate (a)
FPL, and (b) FPF. (Hint: To solve this problem consider using
a coordinate system that is aligned with the principal axes
of the patella instead of the usual vertical and horizontal
axes). (c) Many people assume FQ and FPL are always equal
in magnitude but this is only true under certain
circumstances. Under what conditions are FQ and FPL equal
in magnitude?
Fo
FPF
FP B
GriffithUNIVERSITY
Queensland Australia
The adjacent diagram displays the joint reaction force between the acetabulum and femoral head for the right leg during single leg stance. Also shown are the abductor muscle force (AMF), the weight of the body above the level of the stance hip (W) and their corresponding moment arms with respect to the joint centre (D and D1). If the right leg weighs 1/6 of total body weight, the ratio of D1 to D is 2.4, and AMF is angled at 30 degrees relative to the vertical, calculate the:
Abductor muscle force (2 marks).
Hip joint reaction force (2 marks).
Express both answers as multiples of total body weight
Chapter 21 Solutions
Laboratory Manual for Human Anatomy & Physiology (Cat Version)
Ch. 21 - What factors in addition to gender contribute to...Ch. 21 - Prob. 1.2.3ACh. 21 - What is meant by the term motor unit recruitment?Ch. 21 - Prob. 1.2.5ACh. 21 - Complete the following: Compare the strength of...Ch. 21 - Complete the following: Is there a difference in...Ch. 21 - Complete the following: Define muscle fatigue, and...Ch. 21 - Complete the following: Define dynamometry.
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