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Anatomy and Physiology
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Anatomy and Physiology
- Page 114
Organisation of the Body
41
Cells and Tissues
129
Measurement, Errors, Data and Unit Conversion
45
Integument
65
Homeostasis
0
Skeleton and Joints
100
Muscles
98
Gastrointestinal System
140
Endocrine System
102
Renal System
117
Cardiovascular System
365
Respiratory System
130
Nervous System
292
Reproductive System
72
The Physics of Waves: Light Waves, Sound Waves and Ultrasound
62
Ionising Radiation
92
Electricity
35
Biomechanics
58
Body Temperature, Energy and Heat Loss
70
Chemistry for Physiology
279
Show/Hide Answers
Cardiovascular System
Why is the myocardium of the right ventricle (RV) thinner than that of the left ventricle (LV)?
The RV pumps into the pulmonary circuit which has less resistance than the systemic circuit.
The RV pumps a smaller volume of blood than the LV.
The RV pumps blood out with a slower exit speed than the RV.
The RV chamber has a smaller volume than the LV.
The RV pumps against a lesser resistance; it does not need to be as muscular as the LV.
Author:
rikazzz
Comment
The Physics of Waves: Light Waves, Sound Waves and Ultrasound
The wave equation for electromagnetic radiation may be stated (in words) as “the product of wavelength and frequency is a constant called the speed of light”. The speed of light is 3 × 10
8
m/s. Use this information to determine the frequency of an electromagnetic radiation with a wavelength of 600 nm.
5 × 10
14
Hz
2 × 10−
17
Hz
1.8 × 10
14
Hz
1.8 × 10
11
Hz
v = fλ so f = v/λ = 3 × 10
8
m/s ÷ 600 nm = 3 × 10
8
m/s ÷ 600 × 10−
9
m = 1800 × 10
8
−
−
9
= 1800 × 10−
17
= 1.8 × 10
14
Hz.
Author:
rikazzz
Comment
Muscles
A skeletal muscle fibre (cell) consists of many sections (units) which contract. What is the name given to one of the units that contract?
Sarcomere
Sarcolemma
Sarcoplasm
Fasciculus
A muscle fibre consists of many sections (sarcomeres) connected end to end that shorten (contract) as the thick and thin filaments slide past each other.
Author:
rikazzz
Comment
Cells and Tissues
Which of the following is NOT a component of the cell plasma membrane?
Cholesterol
Proteins
Microfilaments
Phospholipids
Microfilaments occur inside the cell.
Author:
rikazzz
Comment
Cardiovascular System
The quantity called “pressure” is defined as the:
Mass per unit area
Force per unit area
Height of mercury supported by the atmosphere
Newton per square metre
Pressure = force ÷ area. Force and mass are different. Newton per square metre is the unit but not a definition of pressure.
Author:
rikazzz
Comment
Skeleton and Joints
Where do osteocytes reside?
In lamellae
In endosteum
In trabeculae
In lacunae
Lacunae are the spaces within the lamellae of an osteon which are occupied by a bone cell (osteocyte).
Author:
rikazzz
Comment
Gastrointestinal System
Which of the following is a function of bile?
To attach to vitamin B12 to allow it to be absorbed
To activate trypsinogen, chymotrypsinogen and procarboxypeptidase
To digest fats
To disperse large lipid globules into smaller droplets
This is known as emulsification.
Author:
rikazzz
Comment
Gastrointestinal System
Why are sinusoids the type of capillaries found within a liver lobule?
To allow for mixing of blood from the hepatic artery and the hepatic portal vein
So that liver-synthesised plasma proteins may enter the blood
To allow worn out red blood cells to leave the bloodstream.
In order for the products of digestion to be removed from the blood
The epithelial cells that make up sinusoids have gaps between them large enough for plasma proteins to fit through and to enter the blood.
Author:
rikazzz
Comment
Cardiovascular System
Which of the following is the statement of the behaviour of enclosed liquids when a pressure is applied to them, which is known as Pascal’s principle? “When pressure is applied to an enclosed liquid that is at rest, the pressure:
In the liquid falls uniformly throughout the volume”.
Throughout the liquid is unchanged”.
In the liquid rises uniformly throughout the volume”.
In the liquid oscillates between a higher value and a lower value until the source of pressure is removed”.
Pascal’s states that the pressure is transmitted undiminished to all parts of the liquid and its container. That is, the pressure rises uniformly.
Author:
rikazzz
Comment
Cardiovascular System
Which of the following does NOT influence the resistance to blood flow?
Diameter of the arterioles
Temperature of the blood
Haematocrit
Radius of the veins
Resistance to blood flow is of interest on the arterial side of the circulation. Radius of veins is much greater than radius of arteries. Temperature does affect blood flow, for example, in the situation of extremities with “frostbite”.
Author:
rikazzz
Comment
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