BIO325H5 Lecture : Jan. 25 Lecture notes

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emeralddog909

6 Feb 2011

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As you reduce the volume in the ampula the volume foes into the tube foot making it longer (not wider because of retractor muscles) Hold on to its prey (bivalves) using its tube foot. A glue like substance is excreted on the shell of the bivalve and its becomes a tug of war. Know the difference of the medusa form about polyp. Myoepithielium: muscle fibers (no actual muscles muscles in the medusa) contract to push the jellyfish. Mesoglea stretch the myoepthilium back to its original state. Fish swim retrograde waves, send waves of contraction from head. Direct waves move in the same way as the organism moves.

Related Questions

Question 5. Dr. Campbell used an elliptical trainer for 40 minutes at the gym. Although the workload remained constant, Dr. Campbellâs heart-rate rose to 150 beats per minute during the first 5 minutes, stayed at that level for the next 25 minutes and then started to rise. It was 180 beats per minute at the end of the exercise period.

What was the time interval between QRS complexes when Dr. Campbellâs heart rate was 180 beats per minute?

a. 3.3 ms

b. 33 ms

c. 333 ms

d. 3333 ms

Question 6. In the question 5 above, Dr. Campbellâs heart rate is most likely to have risen during the last 10 minutes of exercise because his:

a. lungs were becoming congested

b. atrial cells were fatigued

c. extracellular Ca2+ concentration had increased

d. hematocrit increased due to sweating

Question 7. A Physiology student is sitting still in a cold igloo. After 30 minutes, she stands up, walks slowly around the igloo, and suddenly starts to shiver.

The student preserved their core temperature while they were sitting by:

a. depressing their Frank-Starling mechanism

b. decreasing the extracellular Ca2+ concentration

c. relaxing smooth muscles in their peripheral circulation

d. increasing the resistance of arterioles in their arms and legs

Question 8. In the question 7 above, the student started to shiver soon after walking because:

a. their atria started to fibrillate

b. their ventricles started to fibrillate

c. blood moved to the periphery, became cold, and chilled the core when it returned to the chest

d. the ATP concentration in their skeletal muscles had dropped to zero

Please use the following scenario for answering the questions 9 and 10.

A newly discovered drug binds to myosin molecules in cardiac muscle (and nowhere else) and increases the probability that myosin molecules in ventricular cells will bind to actin filaments when the intracellular Ca2+ concentration rises. The drug is being tested as a potential therapy for patients with heart failure.

Question 9. This drug might help people who have low cardiac output by:

a. increasing peripheral resistance

b. increasing the force developed by ventricular cells

c. increasing the isovolumic contraction time

d. increasing heart rate

Question 10. The increased binding of cardiac myosin molecules to actin might prevent the drug from being a useful treatment by:

a. slowing ventricular relaxation

b. decreasing the duration of systole

c. decreasing resistance of capillaries

d. slowing heart rate

cyanduck846

1. CAN BE MORE THAN ONE The arthropods are the most successfulgroup of animals; several key features explain their success. Checkall of the features that one would use to classify members intothis phylum.

growth takes place throughecdysis

a rigid exoskeleton made ofchitin

closed circulatory systems

jointed appendages

a rigid exoskeleton made ofkeratin

segments specialized intofunctional tagmata
2. An entomologist observed a locust sitting on a branch pumpingits abdomen like an accordion. What is the insect doing?

Stretching out its pedipalps

Assisting gas exchange in thetracheal system

Speeding the flow of blood throughits veins and arteries

Clearing its spinnerets

3.Dibenzoylhydrazines are a category of molecules that have beenused as insecticides. They work by blocking ecdysteroid receptors.How does this kill an insect?

The chitinous exoskeleton isdissolved.

The insect can no longer excretenitrogenous wastes.

The insect can no longer coordinateits movements.

The insect cannot molt.

4. The grasshopper equivalent of an ear is found

on the side of its head.

on the abdomen.

Grasshoppers do not have afunctional equivalent to ears.

directly behind the antennae.

5. A snail in your garden and an oyster are quite different inappearance. What would be evidence to justify grouping themtogether?

Both have a mantle capable ofsecreting calcium carbonate.

Both use siphons to obtainoxygen.

Both have sensory antenna.

Both use a radula for feeding.

6.Barnacles are sessile filter feeders but unlike bivalves theyhave internal fertilization. How do they solve this problem?

They are only capable of asexualreproduction.

The filter sperm from the watercolumn.

They are hemaphrodites withespecially long penises.

They get fertilized during free living larval stages.

7. Bivalves lack a radula. How dothey eat?

The gills filter water and extractorganic matter.

The mantle traps and moves sedimentto the stomach for digestion.

Inhalent siphons suck water intothe mouth.

Most bivalves have photosynthetic endosymbionts in the visceralmass.

8.If a marine biology student discovered a dorsoventrallyflattened marine worm, what would be an effective way to determineif the specimen was a flatworm or a ribbon worm?

Examine the morphology of theexcretory system.

Look for a head at the anteriorend.

Determine the number of embryonicmembranes.

Look for an anus.

9.Inside its beak an octopus has a rasping tongue that is usedto tear apart food, which gastropod structure is this analogousto?

Nephridium

Radula

Shell

Mantle

10.Pinworm is spread by contact, and the worms cause severeitching around the anus. Why is it so common?

Insect vectors spread thedisease.

The intense itch produces anintense desire to scratch.

The eggs end up in the soil.

Sometime people don't wash their hands after scratching theirperi-anal region.

11.Why would a leech have a hard time feeding if it did notproduce anticoagulants?

The blood would stop flowing aftera short time.

The leech would have a hard timeremaining attached to its host.

The leech would have a hard timelocating appropriate hosts.

The pain of the leech bite would cause the leech to bedetected.

12.The scolex of a tapeworm contains the mouth and the anteriorneural ganglia.

True

False

13.In what way are a human and a crab similar?

Both have a continuos growthpattern.

Both have closed circulatorysystems.

Vertebrates and arthropods aredeuterostomes.

Both have muscles that pull against rigid skeletons.

14.What is a simple way for determining if an annelids is apolychaete or a clitellate?

The amount of setae

Possession of a closed circulatorysystem

The layout of the digestivesystem

The number of segments

15.At a celebratory dinner for a recent publication, a marinebiologist ordered the lobster claw appetizer. What part did sheorder?

Telson

Uropods

Nauplius

Cheliped

16.Humans have directdevelopment, a closed circulatory system, well-developed eyes, andlarge brains. Which mollusk also shares these features?

	Octopus
	Slug
	Chiton
	Nudibranch

peachdolphin965

Question 1. Increased peripheral edema could be caused by:

a. blocked lymph vessels

b. decreased capillary blood pressure

c. increased concentration of albumin in the blood

d. slowed heart rate

Question 2. The pulse pressure of a healthy student is most likely to be:

a. 5 mm Hg

b. 30 mm Hg

c. 95 mm Hg

d. 120 mm Hg

Question 3. beta-blockers inhibit the activity of beta-adrenergic receptors and change the function of the heart by:

a. increasing heart rate and increasing contractility

b. increasing heart rate and decreasing contractility

c. decreasing heart rate and increasing contractility

d. decreasing heart rate and decreasing contractility

Question 4. In cardiac pacemaker cells, the L-type calcium channels:

a. open during diastole

b. close when the membrane potential rises above threshold

c. are located in the cell membrane

d. pump Ca2+ ions into the sarcoplasmic reticulum