Regulation of Body Temperature

Question 1

What is homeothermic ?

Answer 1

very narrow limits that the Animals, and peoples, capable of
maintaining their body temperatures within it .

Question 2

When the biochemical reactions frees?

Answer 2

1. When constant body temperature.

2. Fluctuating with the external temperature.

Question 3

What can cause large elevations of temperature ?

Answer 3

cause nerve
mal function and protein denaturation.

Question 4

When Some people suffer convulsions?

Answer 4

at a body
temperature of 41°C (106°F).

Question 5

43°C is considered:

Answer 5

absolute limit
for survival.

Question 6

The temperature of rectal ?

Answer 6

(known as core temp. Or
internal temp)

Question 7

Oral temperature averages about

Answer 7

0.5°C
less than rectal

Question 8

Why the internal temperature varies several

degrees ?

Answer 8

response to activity pattern and
changes in external temperature.

Question 9

variation in women is a

higher temperature, what occur?

Answer 9

during the second half
of the menstrual cycle.

Question 10

Maintaining a constant body temperature , how?

Answer 10

in the steady state
heat production must equal heat loss.

Question 11

What mean the Radiation?

Answer 11

is the process by which the
surfaces of all objects constantly emit heat
in the form
of electromagnetic waves.

Question 12

What mean the Conduction?

Answer 12

is the loss or gain of heat by
transfer of thermal energy during collisions
between adjacent molecules.

Question 13

heat in the Conduction?

Answer 13

heat is “conducted” from molecule to
molecule.

Question 14

What mean the Convection?

Answer 14

is the process whereby
conductive heat loss or gain is aided by
movement of the
air or water next to the body

Question 15

air next to the body is heated by?

Answer 15

by conduction moves away, and carries off the heat just taken from the body. The air that moved away is replaced by cooler air, which in turn follows the
same pattern.

Question 16

What mean the Evaporation?

Answer 16

of water from the skin and
membranes lining the respiratory tract is the
other major process for loss of body heat.

Question 17

What the major process for loss of body heat?

Answer 17

of water from the skin and
membranes lining the respiratory tract .

Question 18

How amount to transform water from the liquid to the gaseous
state?

Answer 18

A very large amount of energy—600 kcal/L

Question 19

whenever water vaporizes from the body’s surface that:

Answer 19

the heat required to drive the process,is conducted from the surface(skin), thereby
cooling it.

Question 20

rates of over 4 L/h of sweat have been

reported in human body;

Answer 20

the evaporation
of 4 L of water would eliminate

almost 2400 kcal from the body!

Question 21

Why It is essential to recognize that sweat must evaporate?

Answer 21

in order to exert its cooling effect.

Question 22

important factor determining evaporation rate is:

Answer 22

water-vapor concentration of the air-that is, the relative humidity

Question 23

The discomfort suffered on humid days ,why?

Answer 23

is due to the failure of evaporation; the sweat glands

continue to secrete, but the sweat simply remains on the skin or drips off

Question 24

Where the structure in the body that temperature-regulating reflexes?

Answer 24

The hypothalamus and other brain areas
contain the integrating centres for
temperature-regulating reflexes

Question 25

What is participate in these temperature-regulating reflexes?

Answer 25

both peripheral and central thermoreceptors participate in these reflexes

Question 26

How Body temperature is regulated?

Answer 26

by altering
heat
production and/or heat loss so as to change
total.

Question 27

Heat production is altered by:

Answer 27

by increasing
muscle
tone, shivering, and voluntary activity

Question 28

how Heat lossed in the body?

Answer 28

by :

• radiation,
• conduction
• convection

Question 29

Heat loss by radiation, conduction, and

convection depends:

Answer 29

depends on the difference between the skin surface and the environment.

Question 30

What occur in the body when is cold?

Answer 30

In response to cold, skin temperature is

decreased by decreasing skin blood flow through reflex stimulation of the sympathetic nerves to the skin.

Question 31

What occur in the body when is heat?

Answer 31

In response to heat, skin temperature is increased by inhibiting these nerves.

Question 32

What the Behavioral responses that influence heat loss?

Answer 32

such as putting on more clothes also influence heat loss.

Question 33

Give examples how Evaporation of water occurs all the time?

Answer 33

insensible loss from the skin and respiratory

lining.

Question 34

Additional water for evaporation is

supplied by:

Answer 34

by sweat ،stimulated by the
sympathetic

nerves to the sweat glands.

Question 35

What is required of temperatures below the thermo neutral zone?

Answer 35

Increased heat production is essential for
temperature regulation at environmental
temperatures below the thermo neutral zone

Question 36

What is required of environmental temperatures above the thermo neutral zone?

Answer 36

sweating is essential at temperatures above

this
zone.

Question 37

What is the cause of fever?

Answer 37

Fever is due to a resetting of the
temperature set
point so that heat production is increased and
heat
loss is decreased in order to raise body
temperature to the new set point and keep it
there.

Question 38

What is the cause of the hyperthermia of exercise?

Answer 38

due to the
increased heat produced by the muscles.