Exam One Ch. One

At the end of 8 weeks, why is the conceptus considered a fetus?

At the end of 8 weeks, why is the conceptus considered a fetus?

All organ systems are present

In which skin layer is areolar tissue found?

Papillary layer

Hair growth cycles:

Anagen, catagen, telogen

Most cells in the body have

Cell membrane, organelles, and cytoplasm

Pre-embryo stage

Fertilization to 2 weeks

Embryonic Stage

2 weeks to 8 weeks

Basic organ development

between 4 and 24 weeks

Fertilization occurs in

uterine tube

Ball of multiple cells is called

Morula

Trophoblasts turn into

part of the placenta

hollow ball of cells is a

blastocyst

At what developmental stage does the conceptus implant in the uterine wall?

blastocyst

Gastrulation

Embryoblast folds in on itself to create a single layer of cells, then into a ball of cells with three different layers.

Ectoderm develops into

skin and nervous systems

mesoderm develops into

muscle, connective tissue, bone, blood, and blood vessels

Endoderm develops into

lining of digestive track, lungs, and glands

Which are the stages of prenatal development in the correct order?

Zygote, cleavage, morula, trophoblast, embryo, fetus

Trimester One

0-13 weeks

Trimester 2

14-27 weeks

Trimester 3

28-42 weeks

Which of the following lists the levels of human structure from smallest to largest?

Atom, Molecule, macromolecule, Organelles, cells, tissues, organs, organ systems, human body

What is in the posterior dorsal cavity?

Cranial cavity and vertebral canal

At what developmental stage does the conceptus reach the uterus?

Morula

What is in the anterior ventral cavity?

Thoracic cavity, abdominopelvic cavity

What is in the thoracic cavity

Pleural cavity, pericardial cavity, mediastinum

What is in the abdominal cavity?

Digestive Organs, spleen, kidneys

What is in the pelvic cavity?

Bladder, rectum, reproductive organs

Which have a double layer of membrane?

pleural, pericardial, peritoneal

What layer lines a cavity?

Parietal

What layer lines an organ?

Visceral

3 layers in development?

Ectoderm, mesoderm, endoderm

Most organs contain tissues derived from

more than one layer