Hornones In Humans

Question 1

What is a hormone

Answer 1

A hormone is a chemical substance produced by a gland and carried by the blood which alters the activity of one or more specific target organs

Question 2

What does the endocrine system depend on

Answer 2

It depends on chemicals called hormones which are released from special gland into the bloodstream

Question 3

What happens after hormones are secreted

Answer 3

They are exchanged by the livee into inactive compounds and exerted by kidneys

Question 4

What is the other name for endocrine gland

Answer 4

Ductless glands

Question 5

What do responsenof hormones on body depend on

Answer 5

The speed of circulatory system and on tome it takes for cells to change their chemical activities a

Question 6

What do hormones affect

Answer 6

Growth rate , puberty. , pregnancy

Question 7

Describe the thyroid gland

Answer 7

Produce a hormone called thyroxine which has an effect on metabolic rate of body

Question 8

What does the medulla do

Answer 8

Recents eves nerves form the brain and produces the hormone called adrenaline

Question 9

Affects of adrenaline on the human body

Answer 9

It cause breathing to become faster and deeper

And heart can also beat faster

Question 10

What is oestrogen

Answer 10

It plays a role in the development of female secondary sec characteristics. Eg breast hips. Etc

Question 11

What does Testosterone do

Answer 11

Plays a role in sperm production, fat distribution and maintenance of muscles and strength

Question 12

What do the ovaries and testes produce

Answer 12

Hormones and sperms and ova

Question 13

What is homeostasis

Answer 13

It is the maintenance of a constant internal environment

Question 14

(Skin structure )

Describe the nasal layer

Answer 14

This is where cells are continuously dividing and all using the other left cells nearer the surface. They shed after

Question 15

What is above the basal layer

Answer 15

The epidermis

Question 16

How is melanin produced

Answer 16

By specialized pigment cells on the nasal layer and epidermis
It gives the skin it’s colour

Question 17

Describe functions of the skin

Answer 17

Protection , sensitivity , temperature regulation

Question 18

Decscribe the protective function of the skin

Answer 18

Outermost layer of dead cells on epidermis helps to reduce water loss and provides barrier against bacteria
They protect the skin from damage from sun

Question 19

Describe sensitivity in the skin

Answer 19

In the skin they are receptors which give tide to sensations like heat cold pain and pressure
Sensitivity makes us aware of changes in our surrounds and enables us to avoid damage etc

Question 20

Describe temperature regulation of the skin

Answer 20

Skin helps to keep the body temperature more or less constant It is done by adjusting the flow of blood near the skin surface and by sweating

Question 21

What is the normal body temp

Answer 21

It ranges between 35.8 and 37.7

Question 22

What are the dangerous temperatures

Answer 22

34 and below and 40 and above I

Question 23

How is heat lost from the body surface

Answer 23

Conduction, convection , reduction and evaporation

Question 24

Temperature cool extended explaination

Answer 24

Amount of heat lost is reduced to an extent due to the insulating properties of fatty tissue in the dermis
Heat is gained internally through respiration on the tissues and externally from the surroundings of the sun

Question 25

What is imbalance of gaining and losing heat corrected by

Answer 25

Overheating. Swearing. Overcooking. And shivering

Question 26

Describe overheating

Answer 26

More blood flows near the surface of the skin allowing more heat to be exchanged with surroundings

Question 27

Describe sweating

Answer 27

Swear glands severer swear on the skin surface when this layer of heat evaporated it takes heat from the body and cools it

Question 28

Describe overcooling

Answer 28

Less blood flows near the surface of the skin reducing the amount of heat lost to the surroundings
Swear production stops me his heat lost is reduced

Question 29

Describe Shivering

Answer 29

Uncontrollable bursts of rapid muscular contraction release heat as a result of respiration in the muscles

Question 30

How does the brain play a roll on body temperature

Answer 30

Monitoring the temperature of the blood A region called hypothalamus contains receptions that detect temperature changes and co-ordinate a response to them They send information to the brain about temperature changes