Development

Question 1

Which layer does muscle originate from?

Answer 1

Mesoderm (connective tissue originates from here)

Question 2

Which layer does blood originate from?

Answer 2

Mesoderm(connective tissue originates from here)

Question 3

Which layer does bone originate from?

Answer 3

Mesoderm(connective tissue originates from here)

Question 4

Which layer do lens of the eyes originate from?

Answer 4

Ectoderm

Question 5

Which layer does the PNS originiate from?

Answer 5

Ectoderm

Question 6

Which layer does the CNS originate from?

Answer 6

Ectoderm

Question 7

What layer does your heart and circulatory system originate from?

Answer 7

The circulatory system arises from the mesoderm.

Question 8

True or False: The notocord develops into the CNS

Answer 8

False

Question 9

True or False: The neural crest originates from ectoderm cells.

Answer 9

True

Question 10

What germ layer do the gonads originate from?

Answer 10

Mesoderm

Question 11

Describe the process of neurulation

Answer 11

Question 12

What is the defining characteristic of the gastrula?

Answer 12

It has the three primary germ layers. This stage is after the blastula.

Question 13

Which germ layer does the bladder originate from?

Answer 13

Endoderm

Question 14

Which layer do the kidneys originate from?

Answer 14

Mesoderm

Question 15

Which layer do the gonads originate from?

Answer 15

Mesoderm

Question 16

Put in order from smallest to largest:

Morula

Blastocyst

Zygote

Answer 16

Zygote, Morula, Blastocyst

Question 17

Describe the structure of a blastocyst

Answer 17

Question 18

True or False: The trophoblast develops into the placenta

Answer 18

True

Question 19

Which germ layer do the respiratory and GI tracts originate from?

Answer 19

Endoderm

Question 20

Which layer do the adrenal glands originate from?

Answer 20

Mesoderm

Question 21

What structure feature below does the PNS originate from?

Answer 21

Neural Crest

Question 22

Parturition

Answer 22

Birth

Question 23

Teratogen

Answer 23

substance that interferes with development causing defects or even death in a developing embryo

Question 24

True or False: Before fertilization, the oocyte is known as a rimary oocyte

Answer 24

False, it is a secondary oocyte

Question 25

What are the two major outer layers of the oocyte that the sperm must break through?

Answer 25

Outermost is the corona radiata, second layer is the zona pellucida

Question 26

What prevents polyspermy?

Answer 26

The cortical reaction after the sperm penetrate the membrane. Calcium ions are released and depolarize the membrane making it so it cannot be fertilized by multiple sperm

Question 27

Acrosome

Answer 27

tip of sperm, forms the acrosomal apperatus during fertilization which extends to penetrate cell membrane

Question 28

When does meiosis II occur?

Answer 28

After fertilization has occured

Question 29

True or False: in development, the wolfarian duct develops in females and the mullerian duct forms in males

Answer 29

False, the opposite is true

Question 30

In fetuses, what carries oxygenated and deoxygenated blood to and from the fetus?

Answer 30

Oxygenated blood is carried to the fetus through the umbilical veins (carries blood toward the fetus from the placenta), deoxygenated is carried vis umbilical arteries (carries blood away from the fetus towards placenta)

Question 31

True or False: Lungs function in a developing fetus

Answer 31

False, they do not. The fetus relies on maternal blood supply

Question 32

True or False: the liver does not function in the fetus

Answer 32

True

Question 33

Ductus Arteriosis

Answer 33

This is one of two shunts that redirects blood away from the lungs. It shunts leftover blood from the pulomonary artery to the aorta so blood goes into systematic circulation.

Question 34

Foramen Ovale

Answer 34

This is one of the fetal shunts that directs blood from the lungs. This is one of two shunts designed to bypass the lungs because lungs are underdeveloped. The foramen ovale is a one way vlave that connects the right and left atrium. Blood entering the right atrium from the IVC flows to the left atrium instead of the the right ventricle so it is pumped directly into systematic circulation.

Question 35

Ductus Venosus

Answer 35

This is the fetal shunt that redirects blood away from the liver. It shunts blood returning form the placenta via the umbilical vein directly to thr IVC

Question 36

What is the major hormone used to detect pregnancy?

Answer 36

HcG- Human chorionic gonadotropin

Question 37

What two hormones coordinate parturition?

Answer 37

Oxytocin and prostaglandins

Question 38

From which germ layer(s) do the tissues of the heart and blood vessels differentiate?

Answer 38

Mesoderm Recall muscle and connective tissue arise fromthe mesoderm