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WorksheetsIB SEHS Option A2
Total questions: 20
Worksheet time: 10mins
A.2.1 Which of the following is NOT a describing the relationship between cellular metabolism and heat production by the body
Humans require energy to produce heat in order to maintain the internal body temp at around 37C
When metabolism decreases, more heat is produced
Typically 60% to 70% of the total energy expended by the human body is degraded to heat
During biochemical reactions heat energy becomes available
A.2.2 The normal physiological range for core body temperature is
36.5
37 degrees Celsius
36 degrees Celsius
39 degrees Celsius
A.2.3 Which of the following describes convection
Transfer heat through direct contact
Transfer of heat through electromagnetic waves
Heat loss through the conversion of water to vapour
Moving heat by the motion of a gas, liquid, air passing over the skin
A.2.4 Which two answers describe evaporation
Primary avenue for heat loss. It accounts for 80% of total heat loss when active
Limits body heat loss during exercise
Sweat reaches the skin, it is converted from a liquid to a gas, heat is lost from the skin in the process
Effects our perception of thermal stress
A.2.4 Which two answers describe humidity?
When high the air contains more water molecules, and this decreases its capacity to accept more water
Provides cooling
As body core temp increases, sweat production increases and sweat evaporates
Associated with a greater incidence of heat related illness during exercise
A.2.5 Which of the following is NOT a consideration in the formation of sweat and the sweat response?
A clear watery liquid is produced in the sweat glands
Sweat is produced in the hair follicle in the dermis of the skin
The amount of sweat the body can produce is dependent on the amount of sweat the gland can produce on the surface of the skin in most individuals
Heavier individuals tend to have a higher sweat (at the same relative exercise intensity)
A.2.6 Are these physiological responses that occur during prolonged exercise in the heat? Increased sweating, decrease in blood volume, heart rate increases, blood flow increases and reduced in stroke volume
True
False
A.2.7 Which of the following describes heat cramp?
Muscle spasms
Vomitting
Sweating may or may not be present
A.2.7 Which of the following describes Heat Exhaustion
Associated with core body temp of 40C or higher
Associated with core body temp equal to or greater than 39 C
Associated with core body temp less than 39 C
A.2.7 Which of the following is a symptom of Heat Stroke
Involuntary jerking of muscles
Fainting
coma or convulsions
A.2.8 Which of the following is NOT a method to prevent heat related disorders?
Rest
train in the heat of the day
Appropriate consumption of electrolytes
Reduce intensity
A.2.9 Which of the following is NOT a way to acclimatise to heat stress?
Full adaptation takes 15 to 18 days for most individuals
Progressively increase duration
Train in the environment
Train for approx 100 mins for best results
A.2.10 Are the following physiological and metabolic adaptations that occur with acclimatisation? Increased plasma volume and sweat response, sweating starts earlier, sweat is more dilute, reduced rate of muscle glycogen utilization and less blood flow to the skin so more blood is available for the active muscles.
True
False
A.2.11 Which of the following does NOT describe the principle means by which the body maintains core temp in cold environments?
Vasodiation
Hairs trap air
Shivering
Non-shivering thermogenesis
A.2.12 Who would lose heat quicker due to their surface area to volume ratio?
100kg 6ft tall male
A newborn baby
A.2.13 Which creates a higher heat loss in the body?
Humidity
Wind
Rain
A.2.14 Which of the following describes why it is difficult to thermoregulate when swimming in cold water?
Conduction in cold water results in increased heat loss
Water is approximately 25 times more conductive than air
Thermal strain of cold water is less
A.2.15 Are the following physiological responses to exercise in the cold? Slows nerve and muscle velocity which results in slower and weaker muscle contraction, muscles lose flexibility.
True
False
A.2.16 Which of the following describes hypothermia
Is the initial freezing of superficial skin tissue
It occurs in body parts farthest from the hear
It is possible for nerves to become damaged
There is a risk of gangrene
Lowering of body temperature below 35 degrees Celsius
A.2.17 Which of the following is NOT a precaution to take when exercising in the cold?
Ensure clothing is used as a barrier
Cover your head
Cover your mouth
Don't over hydrate
Stay dry
