CONCEPTUAL INTEGRATED SCIENCE (PEARSON+
3rd Edition
ISBN: 2818440059223
Author: Hewitt
Publisher: PEARSON+
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Chapter 19, Problem 87TE
To determine
To find:
The way in which humans can bend and straighten their arms irrespective of the fact that "muscles can only pull and not push".
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An individual leans forwards to pick up a box of 100 N. The weight of his upper body has a magnitude of 450 N. The back is pivoting around the base of the vertebral column. Consider the back of the individual as a rigid bar that is controlled by a muscle with an angle of 12° (See picture, d = trunk-head distance = 1 m).a) Calculate the magnitude of muscle force required to lift the box.b) Calculate the magnitude of the force at the base of the vertebral column. Hints: For (a) solve the equilibrium of moments, i.e. what force is required in the muscle to balance out the moments acting around the base of the spine.For (b), solve the equilibrium of forces acting on the spine, including the muscle force you’ve just calculated, in x and y separately. There are two extra forces not shown in the diagram: x and y contact forces acting at the base of the spine. These are whatever is needed to keep the total forces acting on the spine = 0 (so the spine isn’t accelerating off in some…
A person bending forward to lift a load "with his back" (Figure a) rather than with his knees" can be injured by large forces exerted on the muscles and vertebrae. The spine pivots
mainly at the fifth lumbar vertebra, with the principal supporting force provided by the erector spinalis muscle in the back. To see the magnitude of the forces involved, and to
understand why back problems are common among humans, consider the model shown in Figure b, of a person bending forward to lift a W-195-N object. The spine and upper
body are represented as a uniform horizontal rod of weight W-295 N pivoted at the base of the spine. The erector spinalls muscle, attached at a point two-thirds of the way up the
spine, maintains the position of the back. The angle between the spine and this muscle is 12.0°
Back muscle
Pivot
R₂
T120
T
W
W₂
0
(a) Find the tension in the back muscle.
KN
D
(b) Find the compressional force in the spine. (Enter the magnitude.)
KN
Chapter 19 Solutions
CONCEPTUAL INTEGRATED SCIENCE (PEARSON+
Ch. 19 - What are the four main types of tissues in the...Ch. 19 - Multiple tissues combine to make an_____, a...Ch. 19 - What is an organ system?Ch. 19 - What is homeostasis?Ch. 19 - Prob. 5RCCCh. 19 - Prob. 6RCCCh. 19 - Which part of the brain is responsible for balance...Ch. 19 - Prob. 8RCCCh. 19 - Describe the functions of each of the four lobes...Ch. 19 - Which structures make up the central nervous...
Ch. 19 - Prob. 11RCCCh. 19 - What are the functions of sensory neurons,...Ch. 19 - Prob. 13RCCCh. 19 - What are the two types of hormones? How does each...Ch. 19 - Why is the anterior pituitary sometimes called the...Ch. 19 - Prob. 16RCCCh. 19 - Prob. 17RCCCh. 19 - Prob. 18RCCCh. 19 - How do sperm get past the zona pellucida that...Ch. 19 - Prob. 20RCCCh. 19 - Prob. 21RCCCh. 19 - Prob. 22RCCCh. 19 - How does a signal from a motor neuron result in...Ch. 19 - Prob. 24RCCCh. 19 - Prob. 25TISCh. 19 - Prob. 26TISCh. 19 - Prob. 27TISCh. 19 - What causes an action potential to travel down a...Ch. 19 - How does an electrical synapse work?Ch. 19 - Prob. 30TISCh. 19 - Why do action potentials travel more quickly down...Ch. 19 - Why havent any animals evolved large numbers of...Ch. 19 - Prob. 33TISCh. 19 - Prob. 34TISCh. 19 - Prob. 35TISCh. 19 - Prob. 36TISCh. 19 - What are the two types of light-sensitive cells in...Ch. 19 - Describe how sound waves enter the ear and...Ch. 19 - Prob. 39TISCh. 19 - Prob. 40TISCh. 19 - Prob. 43TCCh. 19 - The membrane potential is the electrical potential...Ch. 19 - Rank the two types of light-sensitive cells, rods...Ch. 19 - Two different types of neurons transmit pain...Ch. 19 - The human retina has an area of about 1000 mm2. If...Ch. 19 - You have about 1000 different kinds of smell...Ch. 19 - The egg is a large cell and contributes almost all...Ch. 19 - Is the brain a tissue, an organ, or an organ...Ch. 19 - The stomach is an organ. Describe some of the...Ch. 19 - Why do you shiver when you are cold?Ch. 19 - Prob. 53TECh. 19 - When you exercise, your cells use more oxygen and...Ch. 19 - This man is cooling off after an intense run. He...Ch. 19 - When you move your body, is your cerebrum in...Ch. 19 - Why is the surface of your brain wrinkled?Ch. 19 - Prob. 58TECh. 19 - Describe the structure of a typical neuron.Ch. 19 - Of the three types of neuronssensory neurons,...Ch. 19 - What happens during the fight or flight response?Ch. 19 - Is a neuron that slows your heartbeat part of the...Ch. 19 - What is an action potential? Describe how the...Ch. 19 - Prob. 64TECh. 19 - What would be the effect of removing the myelin...Ch. 19 - Prob. 66TECh. 19 - Prob. 67TECh. 19 - Why is Ohms law important to how quickly an action...Ch. 19 - Prob. 69TECh. 19 - Prob. 70TECh. 19 - Prob. 71TECh. 19 - Prob. 72TECh. 19 - Many nocturnal animals have only rods in their...Ch. 19 - Are your rods or cones are more important for...Ch. 19 - Prob. 75TECh. 19 - In some people, the bones of the middle ear...Ch. 19 - Prob. 77TECh. 19 - Prob. 78TECh. 19 - On a brilliant, sunny day, you take a long hike...Ch. 19 - Prob. 80TECh. 19 - Prob. 81TECh. 19 - Prob. 82TECh. 19 - Prob. 83TECh. 19 - Does a fertilized human egg make anything other...Ch. 19 - Prob. 85TECh. 19 - Prob. 86TECh. 19 - Prob. 87TECh. 19 - Prob. 88TECh. 19 - Prob. 89TECh. 19 - Prob. 90TDICh. 19 - Prob. 91TDICh. 19 - Prob. 92TDICh. 19 - If a signaling neuron has an excitatory effect on...Ch. 19 - Stars come in different colors depending on their...Ch. 19 - Prob. 95TDICh. 19 - Jet lag describes the fatigue and disorientation...Ch. 19 - Prob. 97TDICh. 19 - Prob. 98TDICh. 19 - Prob. 99TDICh. 19 - Explain what happens when you wiggle your toe....Ch. 19 - Prob. 1RATCh. 19 - Which of the following does NOT play a role in...Ch. 19 - Which part of the brain controls posture, balance,...Ch. 19 - Prob. 4RATCh. 19 - What happens at the start of an action potential?...Ch. 19 - Which of the following allows an action potential...Ch. 19 - Chemoreception characterizes a vision. b hearing....Ch. 19 - Prob. 8RATCh. 19 - The structure that provides oxygen and nutrients...Ch. 19 - Prob. 10RAT
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