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Chapter 34: Problem 11

Which of the following structures is involved in mating in birds? a. cloaca b. spermatheca c. uterus d. coelom

Short Answer

Expert verified
The cloaca is involved in mating in birds.

Step by step solution

01

- Identify the function of each structure

First, it's important to understand what each structure does: - Cloaca: A common cavity at the end of the digestive tract for the release of both excretory and genital products in vertebrates except most mammals. - Spermatheca: An organ in certain female invertebrates (especially insects) that stores sperm received during copulation. - Uterus: A reproductive organ in mammals where the fetus develops. - Coelom: A body cavity within animals that houses the internal organs.
02

- Determine which structure is specific to birds

Given the definitions, identify which structure is involved in the reproductive process of birds. Birds do not have a uterus like mammals do. Spermatheca is related to invertebrates and not typically found in birds. The cloaca, on the other hand, serves as a common exit for both the digestive and reproductive tracts in birds.
03

- Conclude the correct answer

From the understanding, the cloaca is specifically involved in the mating process of birds, facilitating the transfer of sperm.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

cloaca function
In birds, the cloaca is a multifunctional structure that plays a critical role in their reproductive system. The cloaca is essentially a common cavity at the end of the digestive tract where the intestinal, urinary, and genital tracts converge. This might sound complex, but it serves essential functions, especially during the mating process.
  • It facilitates the transfer of sperm from the male to the female.
  • It also serves as the exit point for waste products.
  • This structure ensures that both excretory and reproductive activities can happen seamlessly in birds.
During copulation, the cloaca of the male bird aligns with that of the female, allowing the transfer of sperm. This process is known as the 'cloacal kiss', a key moment in bird reproduction.
spermatheca in invertebrates
In certain invertebrates, especially insects, the spermatheca is a specialized organ designed to store sperm after mating. This organ ensures that the female can control the timing of fertilization.
  • The spermatheca stores the sperm until the female is ready to fertilize her eggs.
  • This allows for greater flexibility in reproduction.
  • It can be found in creatures like bees, ants, and many other insects.
The ability to store sperm leads to various evolutionary advantages, such as ensuring genetic diversity and optimizing the timing of birth for offspring survival.
uterus function
In mammals, the uterus is a vital reproductive organ where the embryo develops into a fetus. This organ provides a protective and nourishing environment for the developing embryo.
  • The inner lining, known as the endometrium, thickens to prepare for potential implantation of an embryo.
  • It enables the passage of nutrients and oxygen from mother to developing fetus through the placenta.
  • This organ is crucial for live births in mammals.
The uterus is specifically adapted for sustaining pregnancy, ensuring that the developing offspring have the best chances of survival once born.
coelom definition
The coelom is a fluid-filled body cavity within animals that serves several crucial functions. It houses and protects internal organs and provides a medium for the transport of gases, nutrients, and waste products.
  • It separates the gut from the body wall, allowing for greater flexibility and movement.
  • This cavity can be found in various animal phyla, including annelids, mollusks, and chordates.
  • It also plays a role in the development and structure of the body's organs.
The coelom allows for the efficient organization and functioning of internal organs, contributing to the complexity and adaptability of organisms.

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Most popular questions from this chapter

What determines whether a zygote will undergo total or partial cleavage? a. Total cleavage takes place in eggs having a large amount of yolk, whereas partial cleavage occurs in eggs having very little or no yolk. b. Total cleavage occurs when eggs possess equal concentration of yolk at both poles, whereas partial cleavage occurs when the yolk is not equally distributed. c. Total cleavage takes place in eggs having little or no yolk, whereas partial cleavage occurs in eggs having a large amount of yolk. d. Total cleavage occurs when divisions of the blastomeres are separate, whereas partial cleavage occurs when blastomeres stay partially connected.

How is an oocyte released from a human ovary so it can enter the oviduct? a. the beating action of the flagellum on the oocyte b. the force of the follicular ejection directing the oocyte into the oviduct c. the wavelike beating of cilia lining the oviduct d. muscular contraction of the ovaries

Gastrulation is the process in which the cells in the blastula rearrange themselves and form three layers of cells. Each layer will differentiate into a different organ system. At what point of development do the major organs begin to develop? a. fertilization b. first trimester c. second trimester d. third trimester

Which hormone prepares the endometrial lining of the uterus for potential implantation? a. testosterone b. estrogen c. GnRH d. progesterone

Why is sexual reproduction useful when only half the individuals reproduce and two cells must combine to form a new cell? a. It completes in a very short period of time. b. It results in the rapid production of many offspring. c. It increases genetic diversity, allowing organisms to survive in an unpredictable environment. d. It requires less energy and leads to genetic variation in the offspring.
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