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1D Continued Worksheet
1) Cleavage produces two smaller daughter cells called________________. During cleavage,
____________ or cell division continues without the cell ______________in size.
2) When the cell has reached the 16 or more cell stage the solid ball of cells is referred to as
a__________________.
3) By the 4th of 5th day the _____________ consists of approximately 100 cells and is referred
to as a_________________, which is a ___________filled hollow sphere.
4) The outer layer of cells of the blastocyst, which is a single layer of cells referred to as
the__________________, forms the______________. While the inner cell mass referred to
as the __________________ disc develops into the individual.
5) Implantation takes place when _____________ adhere to the properly prepared_________.
6) Once implanted the __________________proliferate and form two distinct layers,
the____________________ , which are cells of the inner layer and they _________their cell
membranes, where the ____________________which make up the outer layer ________their
plasma membrane and invade the_______________________ .
7) The primitive streak is a raised area on the _____________groove and establishes the
______________ axis of the embryo.
8) The rod of mesodermal cells that serves as the _________or longitudinal support is referred
to as the________________.
9) Gastrulation sets the stage for ____________________which is the formation of all body
organs.
10) __________________ is the first event of organogenesis which gives raise to the _______
and __________________.
11) Somites, are one of the ___ specialized groups of_____________, and are lusters of cells,
_____pairs, that are made up of ___________________which produce ______________and
ribs. __________________which help form ____________skin dermis and ______________
which form skeletal muscle of the__________, trunk, and____________.
12) __________________Mesoderm forms gonads, which are __________or
______________ along with kidneys.
13) Placenta forms from embryonic __________________ tissues and maternal
_______________ tissues.
14) Chorion develops fingerlike villi that become ________________ and extend to the embryo
as umbilical __________ and_________ , it also helps forms the placenta by ____________
the embryonic body and all other membranes.
Unit 1E
15) Functions of the skin are: a barrier or _______________, temperature______________,
___________, metabolism in the ____________ of Vitamin D, blood ____________and
limited___________.
16) Skin consists of two major regions the______________, the outer most and
the__________, the middle region and the layer beneath is referred to as the
__________________or superficial______________.
17) Epidermis is composed of____________ _______________ epithelium, and the dermis and
hypodermis are composed of _______________tissue.
18) As cells of the epidermis, _________________ produce the fibrous protein keratin, and
melanocytes which produce the brown pigment___________, but skin also gets its color from
____________ and blood vessels.
19) Langerhans cells are epidermal _______________that help activate the _________system,
while tactile cells such as ___________ cells functions as touch ____________in association
with ____________ nerve endings.
20) Stratum _________which is the base layer or __________ epidermal layer which is
attached to the__________. Here the youngest ____________cells undergo rapid division
called ___________ to regenerate the superficial layers.
21) The next layer up is the Stratum___________, which gets its name due to the web-like
system of the cells which has pre-keratin ___________ attached to ____________ which gives
it a “prickly look. In this layer _________ granules and ___________ cell are abundant.
22) This middle layer is the Stratum ___________a thin layer with only __ to __ layers of cells
which are __________ and organelles are______________. It gets its name due to the
________________and ____________ granules accumulating in the granulosum cells and this
provides___________________.
23) Second from the top is the Stratum __________ or clear layer which is thin and
____________ and consists of a few layers of flat dead _____________and is present only in
thin / thick skin.
24) The very top or outer most layer is the Stratum ______________or the Horny Layer, of
_________________ cells meaning the cell’s ____________ and organelles are replaced by
keratin _____________which is left as the cells die. This layer provides most of the
________________ thickness.
25) The functions of the epidermis are________________, protection from ___________
and__________________.
26) Dermis is vascular and _____________ and has two regions, superficial also called _______
and deep also called_______________.
27) The ___________ region is loose __________ connective tissue, and the dermal papillae
which are finger like ______________ into the epidermis and have __________endings that
detect_______, touch and _____________have increased _________ vessels and
modified_____________. Vitamin D is ______________ here.
28) The reticular region is composed of _________ connective tissue in which _________and
elastic fibers run ___________to skin’s surface, and the spaces are filled with ________tissue.
29) The superficial _________ or hypodermis which covers the __________ under the skin has
__________ from the dermis that ___________the skin to deeper________and_________.