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bio7

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File contents
129A
BIOLOGY 7
1 GROWTH
The growth of an organism may involve
an increase in cell size and/or in
cell numbers.

Growth requires: MATERIALS (e.g.

protein), ENERGY and STIMULUS (e.g.

hormone).

PATTERNS OF GROWTH

Growth may be
continuous (though
at different
rates), with a
gradual increase in
mass and size.

Graph shows human
male:
Mass (kg) and
Age (years).
p
0
#
2 GROWTH
Growth may be discontinuous, with
periodic increases, such as occurs
with an insect.

This graph shows such a growth
pattern, arrows indicating moults.

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            T I M E
#
3 GROWTH HORMONES

The mammalian growth hormone is made

in the PITUITARY gland.



Plant growth

hormone (AUXIN) can

be collected in

agar and used in

experiments, as

shown.
p
1
#
4 SKELETONS AND SUPPORT
Plants are supported by CELL WALLS,

TURGOR (osmotic pressure) and WOODY

XYLEM. Animals need some kind of

SKELETON.

This may be:

FLUID (e.g. earthworm)

HARD, EXTERNAL (e.g. arthropod)

HARD, INTERNAL (e.g. vertebrate)
#
5 HUMAN ARM/LEG

The arm and the leg have equivalent

bones, with the PATELLA or the

knee-cap extra in the leg.

The shoulder and

hip joints are BALL

and SOCKET, the

others HINGE.

The 'funny bone' is

the nerve over

the elbow.
p
2
#
6 ARTHROPOD
The insect skeleton is made of CHITIN

which acts as both skin and skeleton.

The insect body is divided into HEAD,

THORAX, ABDOMEN.

Thorax: Legs

        (3 pairs)

        Wings

        (2 pairs)

The skeleton must

be replaced for

growth.
p
3
#
7 VERTEBRATE SKELETONS
FUNCTIONS:

1) Support of body and weight.

2) Shape, e.g. hand, wing,

   streamlining.

3) Movement: with the attachment of

             muscles, bones become

             levers.

4) Protection of vital organs e.g.

   brain.

5) Breathing: rib cage movements.

6) Making red blood cells, in bone

    marrow.

7) Sound conduction in middle ear.
#
8 VERTEBRATE SKELETONS
Organisation: Skull, Vertebrae, Ribs,

Limbs, Limb Girdles (Pelvic and

Pectoral).

Joint Types: Fixed or Synovial, Ball

and Socket, Hinge, Sliding.


Diagram shows


hinge joint detail.
p
4
#
9 MUSCLES AND MOVEMENT
Muscles can only do work when

contracting. They are arranged in

'ANTAGONISTIC' pairs. For example,

BICEPS bends the elbow joint, TRICEPS

straightens it.

There are three types of mammalian

muscle: SKELETAL, SMOOTH and CARDIAC.
#
10 SKELETAL
SKELETAL, STRIATED and VOLUNTARY

muscle is attached to the bones by

inelastic tendons.

It is under conscious control and

contains large numbers


of MITOCHONDRIA

(for energy

  conversion)

and red MYOGLOBIN.
p
5
#
11 SMOOTH MUSCLE
SMOOTH MUSCLE is INVOLUNTARY. It is

stimulated by the AUTONOMIC NERVOUS

SYSTEM and is not under conscious

control.


Examples are walls of


arteries and the


muscles of the gut.
p
6
#
12 CARDIAC MUSCLE
CARDIAC MUSCLE is found only in the

heart. It is similar to skeletal

muscle, but has branched fibres. The

fibres contract in time due to the

pacemaker.


Diagram shows E.C.G.


(electocardiogram).
p
7
#
13 FLIGHT MUSCLES

Birds have very large flight

(PECTORAL) muscles to lift and lower

the wings.


Insects also have

paired flight muscles,

with some operating

indirectly by squeezing

the thorax.
p
8
#
T
#1
1
Apart from a stimulus and materials,

what is needed for growth?
1
ENERGY
#2
3
Where is the mammalian growth hormone

made?
1
~IN THE
PITUITARY
PITUITARY GLAND
#3
3
What is the plant growth hormone

called?
1
AUXIN
#4
4
What kind of skeleton has an

earthworm?
1
FLUID
#5
5
(a) Which bone in the human leg has no

    equivalent in the arm?

(b) What kind of joint is the

    shoulder?

(c) The 'funny bone' is actually a

    .....

3
~
PATELLA
~
BALL AND SOCKET
~
NERVE
#6
8
What name is given to the fluid found

in joints?
1
SYNOVIAL
#7
6
What is an insect's skeleton made of?
1
CHITIN
#8
9
Which muscle is antagonistic to the

triceps?
1
BICEPS
#9
10
(a) What attaches the skeletal muscle

    to the bones?

(b) Muscles need a lot of energy. In

    which cell organelles is it

    converted?
2
~
TENDON
TENDONS
~
MITOCHONDRIA
#10
12
(a) Which type of muscle occurs only

    in the heart?

(b) It differs from skeletal muscle

    because its fibres are .....

(c) Which type of muscle is found in

    the walls of the arteries?

3
~
CARDIAC
~
BRANCHED
~
SMOOTH
#11
11
Which nervous system controls smooth

muscle?
1
AUTONOMIC
e
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00001290  4f 4e 4f 4d 49 43 0d 65  0d                       |ONOMIC.e.|
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