01:119:116 Lecture 12: Lecture 12

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lavenderminnow556

9 Apr 2016

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Lecture 12: endocrine system i: intro, anatomy - form, physiology - function, structural and functional organization, cells, tissues - groups of cells with similar appearance and function, organs - different tissue types, organ systems, whole organism. Maintaining internal environment: 2 main mechanisms for managing internal environment, regulators, uses internal mechanism to control internal change regardless of external fluctuations, conformer, allows internal environment to vary with certain external changes. Receptor-down regulation (fewer receptors synthesized: if hormone levels are too low. Prostaglandins - local regulators: ~ 16 different types, produced by cells of most mammalian tissues, regulate variety of functions. Contraction of smooth muscle iii: blood pressure. Fig 45. 2: pheromones, chemicals that are released into external environment, targets are other individuals of the species, functions, define territory, provide warning of predators, attraction of mates. Chemical properties of signaling molecules: classes of local regulators (don"t travel far, modified fatty acids, hydrocarbon chains, ex.

Related Questions

MOLECULAR BIO HELP

QUESTION 1

Which of these choices is an example of acclimatization?

		Plants growing in the shade grow larger leaves compared to the leaves growing in direct sunlight.
		A.Pigweed plants ( Amaranthus retroflexus ) growing in North Carolina are more tolerant to heat than plants growing in Canada.
		A.The quadrate bone of snakes is movable rather than rigidl y attached, as seen in other vertebrates.
		A.Desert rodents produce more concentrated urine because of their longer loop of Henle as compared to the loop of Henle found in other rodents living in less arid conditions.

10 points

QUESTION 2

Which of these choices is an example of connective tissue ?

		cardiac muscle
		neurons
		blood
		glial cells

10 points

QUESTION 3

Which of these choices best describes homeostasis ?

		A.maintenance of a relatively constant internal environment
		A.all vertebrates have a similar body plan
		A.exchange of materials with the environment a cell is found in
		A.relationship of the structure and function in animals

10 points

QUESTION 4

You are looking at two cells under a microscope. Both have the same shape, but cell A is smaller than cell B. Which of these statements correctly describes cell B?

		A.The larger cell has less surface area than the smaller cell.
		A.The larger cell has a smaller sur face-to- volume ratio than the smaller cell.
		A.The larger cell has the same surface-to-volume area as the smaller cell.
		A.The larger cell has more surface area than the smaller cell.

10 points

QUESTION 5

Which of these statements is true about ectotherms?

		A.Ectothermic animals tend to be found in arctic regions.
		A.E ctotherms tend to consume more calories than endotherms of similar size.
		A.Ectotherms tend to have more insulating structures than endotherms.
		A.Ectotherms use more energy for reproduction than for heat production.

amethystswan784

The Cambrian explosion is a prime example of ________________.

		mass extinction
		evolutionary stasis
		a large meteor impact
		adaptive radiation

1 points

QUESTION 2

Most animals are viviparous.

True

False

1 points

QUESTION 3

The first phylum with ganglia in their nervous system are the ________________________.

		Mollusca
		Nematoda
		Bivalvia
		Platyhelminthes

1 points

QUESTION 4

The last common ancestor of all animals was probably a _____________________.

		a unicellular worm
		multicellular algae
		flagellated protist
		multicellular fungus

1 points

QUESTION 5

You are given an unknown organism to identify. It is unicellular and heterotrophic. It is motile by use of many short extensions of the cytoplasm. It has well-developed organelles and two nuclei, one large, one small. The organism is most likely to be a ______________.

		foraminifera
		radiolarian
		ciliate
		flagellate

1 points

QUESTION 6

Which of the following organisms would you expect to have the largest surface-area-to-volume ratio? Assume that all of the following are the same total length.

		A mollusc
		A nematode
		A platyhelminth
		Not enough information to determine.

1 points

QUESTION 7

If the animal is a hermaphrodite, it is said to be _______________.

		dioecious
		eutelic
		monoecious
		trioecious

1 points

QUESTION 8

A terrestrial animal species is discovered with the following larval characteristics: exoskeleton, system of tubes for gas exchange and segmentation. A knowledgeable zoologist should predict that the adults of this species would also feature ____________.

		eight legs
		two pairs of antennae
		a sessile lifecycle
		an open circulatory system

1 points

QUESTION 9

The Phylum Echinodermata exhibits metamerism.

True

False

1 points

QUESTION 10

The existence of evolutionary trends, such as increasing body sizes among horse species, is evidence that _____.

		a larger volume-to-surface area ratio is adaptive in many mammals
		evolution generally progresses toward some goal
		evolution tends toward increased complexity or increased size
		in particular environments, similar adaptations can be beneficial to more than one species

1 points

QUESTION 11

Suppose you are a researcher fro a pest-control company and you develop a chemical that inhibits the develpment of an embryonic mosquito's endodermal cells. Which of the following would cause the pesticide to work?

		The mosquito would develop a weak exoskeleton, making it easy prey.
		The mosquito's gut would not function properly and it would starve.
		The mosquito would not have a properly functioning muscular system.
		Nothing would happen and your experiment would be a failure.

1 points

QUESTION 12

Holometabolis refers to complete metamorphosis.

True

False

1 points

QUESTION 13

Which of these conditions are always true of populations evolving due to natural selection?
Condition 1: The population must vary in traits that are heritable.
Condition 2: Some heritable traits must increase reproductive success.
Condition 3: Individuals pass on most traits that they acquire during their lifetime.

		Condition 1 only
		Condition 2 only
		Conditions 1 and 2
		Conditions 2 and 3

1 points

QUESTION 14

Scientific theories _____. 22.3

		are nearly the same things as hypotheses
		are supported by, and make sense of, many observations
		cannot be tested because the described events occurred only once
		are predictions of future events

1 points

QUESTION 15

The evolution of animal species and their diversity is a result of the evolution of new and different ways to _______________.

		reproduce
		arrange their cells into tissues
		become symmetrical
		form an embyro and establish a basic body plan

01:119:116 Lecture 12: Lecture 12

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