Platelet Stocks List

Related ETFs - A few ETFs which own one or more of the above listed Platelet stocks.

Platelet Stocks Recent News

Date Stock Title
Nov 1 SNY Vir Biotechnology Inc (VIR) Q3 2024 Earnings Call Highlights: Strategic Restructuring and ...
Nov 1 SNY Kymera Q3 Loss Narrower Than Expected, Pipeline in Focus
Nov 1 CERS Cerus Third Quarter 2024 Earnings: EPS Beats Expectations, Revenues Lag
Nov 1 AMGN Amgen Third Quarter 2024 Earnings: EPS Beats Expectations
Nov 1 SNY Kymera Therapeutics Inc (KYMR) Q3 2024 Earnings Call Highlights: Strategic Advancements and ...
Oct 31 CERS Q3 2024 Cerus Corp Earnings Call
Oct 31 AMGN Amgen earns higher revenues in Q3 2024, puts rare diseases in the spotlight
Oct 31 AMGN Q3 2024 Amgen Inc Earnings Call
Oct 31 AMGN Amgen 'Laser-Focused' On Its Weight-Loss Shot As New Rival Pfizer Follows, Says CFO
Oct 31 SNY REGN Q3 Earnings and Revenues Beat on Strong Eylea HD & Dupixent Sales
Oct 31 AMGN Amgen Q3 Earnings Beat, Sales In Line, Obesity Candidate in Focus
Oct 31 CERS Cerus Corp (CERS) Q3 2024 Earnings Call Highlights: Strong Revenue Growth and Strategic ...
Oct 31 AMGN Amgen Inc (AMGN) Q3 2024 Earnings Call Highlights: Robust Revenue Growth and Strategic Pipeline ...
Oct 31 CERS Cerus Corporation (CERS) Q3 2024 Earnings Call Transcript
Oct 31 AMGN Amgen Inc. (AMGN) Q3 2024 Earnings Call Transcript
Oct 31 AMGN Amgen Inc. 2024 Q3 - Results - Earnings Call Presentation
Oct 31 AMGN Amgen (AMGN) Q3 2024 Earnings Call Transcript
Oct 30 AMGN Amgen updates 2024 guidance with revenue and EPS ranges including consensus
Oct 30 AMGN Compared to Estimates, Amgen (AMGN) Q3 Earnings: A Look at Key Metrics
Oct 30 AMGN Amgen (AMGN) Beats Q3 Earnings Estimates
Platelet

Platelets, also called thrombocytes (from Greek θρόμβος, "clot" and κύτος, "cell"), are a component of blood whose function (along with the coagulation factors) is to react to bleeding from blood vessel injury by clumping, thereby initiating a blood clot. Platelets have no cell nucleus: they are fragments of cytoplasm that are derived from the megakaryocytes of the bone marrow, and then enter the circulation. Circulating unactivated platelets are biconvex discoid (lens-shaped) structures, 2–3 µm in greatest diameter. Platelets are found only in mammals, whereas in other animals (e.g. birds, amphibians) thrombocytes circulate as intact mononuclear cells.

On a stained blood smear, platelets appear as dark purple spots, about 20% the diameter of red blood cells. The smear is used to examine platelets for size, shape, qualitative number, and clumping. The ratio of platelets to red blood cells in a healthy adult ranges from 1:10 to 1:20.
One major function of platelets is to contribute to hemostasis: the process of stopping bleeding at the site of interrupted endothelium. They gather at the site and unless the interruption is physically too large, they plug the hole. First, platelets attach to substances outside the interrupted endothelium: adhesion. Second, they change shape, turn on receptors and secrete chemical messengers: activation. Third, they connect to each other through receptor bridges: aggregation. Formation of this platelet plug (primary hemostasis) is associated with activation of the coagulation cascade with resultant fibrin deposition and linking (secondary hemostasis). These processes may overlap: the spectrum is from a predominantly platelet plug, or "white clot" to a predominantly fibrin, or "red clot" or the more typical mixture. Some would add the subsequent retraction and platelet inhibition as fourth and fifth steps to the completion of the process and still others a sixth step wound repair. Platelets also participate in both innate and adaptive intravascular immune responses.
Low platelet concentration is called thrombocytopenia, and is due to either decreased production or increased destruction. Elevated platelet concentration is called thrombocytosis, and is either congenital, reactive (to cytokines), or due to unregulated production: one of the myeloproliferative neoplasms or certain other myeloid neoplasms. A disorder of platelet function is a thrombocytopathy.
Normal platelets can respond to an abnormality on the vessel wall rather than to hemorrhage, resulting in inappropriate platelet adhesion/activation and thrombosis: the formation of a clot within an intact vessel. This type of thrombosis arises by mechanisms different than those of a normal clot: namely, extending the fibrin of venous thrombosis; extending an unstable or ruptured arterial plaque, causing arterial thrombosis; and microcirculatory thrombosis. An arterial thrombus may partially obstruct blood flow, causing downstream ischemia, or may completely obstruct it, causing downstream tissue death.

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