IB SEHS Option A2

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