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Bio240 Chapter 46,47

Bio240 Chapter 46,47,40,21

What do budding and fragmentation have in common? A) Both are types of asexual reproduction.
Why is sexual reproduction important? B) The resulting diverse phenotypes may enhance survival of a population in a changing environment.
After sperm cells are produced, they are mainly stored in the C) epididymis.
Where are human sperm cells produced? C) the seminiferous tubules of the testes
Human fertility drugs increase the chance of multiple births, probably because they b) mimic progesterone.
FSH stimulates: b. maturation of ovarian follicles
In vertebrate animals, spermatogenesis and oogenesis differ, in that C) oogenesis produces one functional ovum, whereas spermatogenesis produces four functional spermatozoa.
How do the estrous and menstrual cycles compare? A) Endometrial bleeding occurs during the menstrual cycle; the endometrium is reabsorbed by the uterus during the estrous cycle.
The secretory phase of the menstrual cycle C) corresponds with the luteal phase of the ovarian cycle.
What are the three phases of the ovarian cycle? D) follicular, ovulation, and luteal
Inhibition of the release of GnRH from the hypothalamus will C) inhibit secretion of gonadotropins from the pituitary.
One function of the corpus luteum is to C) produce progesterone and estrogen.
What is the narrow opening of the human uterus called? B) cervix
In humans, fertilization occurs in the ________, and implantation occurs in the ______. d. oviduct, uterus
The membranous sac that forms from the hindgut and stores waste products in birds and reptiles is the: c. allantois
The drug RU486 functions by B) blocking progesterone receptors in the uterus.
Which of the following is a function of the contents of the acrosome during fertilization? C) to digest the exterior coats of the egg
The cortical reaction functions directly in the A) formation of a fertilization envelope.
Which structure in bird and mammalian embryos functions like the blastopore of frog embryos? primitive streak
The development of an organism is controlled by d. all of the above
As cleavage continues during frog development, the number of blastomeres A) increases as the size of the blastomeres decreases.
Which region of the frog blastula corresponds to the future dorsal side of the embryo? D) gray crescent
Which developmental sequence is CORRECT? D) cleavage, morula, blastula, and gastrula
the time of implantation, the human embryo is called a(n) B) zygote.
The yolk of the frog egg E) leads to unequal rates of cleavage for the animal pole compared to the vegetal pole.
After gastrulation, the outer-to-inner sequence of tissue layers in a vertebrate is c) ectoderm, mesoderm, endoderm.
What is the process called that involves the movement of cells into new relative positions in an embryo and results in the establishment of three germ tissue layers? E) gastrulation
Without the formulation of an ectoderm, vertebrates would not form A) a nervous system.
You observe an embryo with meroblastic cleavage, extraembryonic membranes, and a primitive streak. How would you identify this organism, based on the information given? D) bird
Hans Spemann has referred to which of the following structures as the primary organizer in the early development of amphibian embryos? E) dorsal lip of the blastopore
During gastrulation in frogs, a rod of mesoderm under the dorsal surface forms the A) notochord.
The posterior portion of the neural tube will develop into the frog's A) spinal cord.
An increase in which of the following parameters is most important in the evolution of specialized exchange surfaces such as the linings of the lungs or intestines? A) surface area
Collagenous fibers are primarily found in what type of animal tissue? A) connective
Why must multicellular organisms keep their cells awash in an "internal pond"? B) Cells need an aqueous medium for the exchange of nutrients, gases, and wastes.
Muscles are joined to bones by D) tendons.
The epithelium best adapted for a body surface subject to abrasion is E) stratified squamous.
Which muscle tissue is responsible for voluntary movement? B) skeletal muscle only
The involuntary muscles that cause the wavelike contractions pushing food along our intestines are D) smooth muscles.
A group of similar specialized cells, organized as a structural and functional unit is a(n): b. tissue
Which of the following is true of interstitial fluid? D) It provides for the exchange of materials between blood and body cells.
How does positive feedback differ from negative feedback? B) In positive feedback, the effector's response is in the same direction as the initiating stimulus rather than opposite to it.
Which of the following is an important distinction between the measurement of basal metabolic rate (BMR) and standard metabolic rate (SMR)? C) SMRs must be determined at a specific temperature.
In an amphibian embryo, a band of cells called the neural crest C) produces cells that migrate to form teeth, skull bones, and other structures in the embryo.
The body's automatic tendency to maintain a constant internal environment is termed A) homeostasis.
Multinucleate cells are found in: d. skeletal muscle cells
Terrestrial animals mainly exchange heat with the environment by all of the following physical processes except D) illumination.
Consider an ectotherm and an endotherm of equal body size. The ectotherm is more likely to survive an extended period of food deprivation than the endotherm because E) both B and C
Where is the thermostat of vertebrates located? C) hypothalamus
Created by: Liwa91

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